If the application says there is a new texture but does not provide one, reuse the last texture. (#17437)

This matches the behavior of the OpenGL backend.

We were always scaling z by 0, instead of 1. This
caused the z elevation of some layers to be 0,
which was incorrect.

Now that client apps use the same elevations on
Fuchsia and other platforms, shadows should look
identical.

Matches the structure used on Windows of assuming a directory format.

The following issues have been filed to track the handling of these enum values:

* Handle the UITouchTypeIndirectPointer enum value. https://github.com/flutter/flutter/issues/53696
* Handle the UITouchPhaseRegion enum values. https://github.com/flutter/flutter/issues/53695

No change in functionality. Only makes the iOS engine build on the latest
versions of Xcode and iOS SDK. The enum values cannot be used with the
API_AVAILABLE macro because the buildbots have not been updated yet.

Since the trace provider hasn't been created yet, it is not possible to
trace the creation of a trace provider using a TRACE_DURATION event (the
trace enabled and category check will always fail).  While this isn't
causing any urgent problems, remove it to set a good example for other
clients of tracing that might happen to reference this code.

Make the test robust even if the json map reorders its keys.

This PR touches variable names, class names, and file names so it's significantly more risky than its predecessor https://github.com/flutter/engine/pull/17329

Due to file name changes, this PR is expected to change the license files.

We haven't rename `shell/gpu` to `shell/raster` yet. It should be optional but I think it's better to have `raster_surface_software.cc` than `gpu_surface_software.cc`.

https://dart.googlesource.com/sdk.git/+log/11d6bc605512..e8c4aed700f5

git log 11d6bc605512..e8c4aed700f5 --date=short --first-parent --format='%ad %ae %s'
2020-03-31 scheglov@google.com Remove implementedForMixing from inheritance manager.
2020-03-31 scheglov@google.com Fix for crash in WrapInText when the parameter is not InterfaceType.
2020-03-31 rnystrom@google.com Migrate language_2/compile_time_constant to NNBD.
2020-03-31 alexmarkov@google.com [vm/nnbd] Do not treat late final fields as immutable
2020-03-31 lrn@google.com Add specialized classes for ZoneFunction<Function> to handle generics.
2020-03-31 sstrickl@google.com [vm] Check the global object pool (if any) when visiting functions.
2020-03-31 jensj@google.com [CFE] Add "annotate lines" option to parser suite
2020-03-31 sortie@google.com [dart:_http] Fix HeaderValue.parse if valueSeparator is parameterSeparator.
2020-03-31 sigurdm@google.com Bump pub revision
2020-03-31 kustermann@google.com [infra] Update tools/test.py and test matrix for running tests with arm64-qemu
2020-03-31 athom@google.com [co19] Roll co19 to 9934d8540d097366287267519413e888a7f6a482
2020-03-31 dmitryas@google.com [cfe] Apply the special treatment of FutureOr in GLB for NNBD
2020-03-31 karlklose@google.com [infra] Remove unused bot script
2020-03-31 jensj@google.com [CFE] Perform transformPostInference when doing expression compilation
2020-03-31 karlklose@google.com [infra] Remove creation of unused file
2020-03-31 asiva@google.com [Tests] Skip debugger_location_test (see https://github.com/dart-lang/sdk/issues/41219)
2020-03-31 rnystrom@google.com Migrate language_2/canonicalize to NNBD.
2020-03-30 srujzs@google.com [dart:html] Add bool type to supportsTypedData
2020-03-30 scheglov@google.com Deprecate isProxy / isOrInheritsProxy in ClassElement.
2020-03-30 scheglov@google.com Set dynamic resolution for super MethodInvocation in invalid context.

Created with:
  gclient setdep -r src/third_party/dart@e8c4aed700f5

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/dart-sdk-flutter-engine
Please CC dart-vm-team@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: dart-vm-team@google.com

* Add test to make sure we don't regress treeshaking of debugFillProperties
* update cirrus

* fix drawImage style when destination width==source
* Add regression test
* dartfmt
* update golden lock
* Addressed review comment
* remove transform reset since _drawImage is called

git log 1402e8e1a42d..e21c4353006d665e7c4378413ad4d237f18437e0 --date=short --first-parent --format='%ad %ae %s'
2020-03-30 jsimmons@google.com [dart:io] Fuchsia version of SocketBase::AvailableDatagram
2020-03-30 jwren@google.com Fix the dart help test output by implementing printUsage() in the test command
2020-03-30 sstrickl@google.com [vm/aot] Drop some Function objects not needed at runtime.
2020-03-30 mit@google.com Roll pub to latest version
2020-03-30 scheglov@google.com Document differences in inheritance tests between CFE and analyzer.
2020-03-30 scheglov@google.com Revert "Fix the result type of binary expression with the left TypeParameter extends num type."
2020-03-30 johnniwinther@google.com [cfe] Handle member signatures from dill in class hierarchy builder
2020-03-30 eernst@google.com [cfe] Add missing .next in endImplicitCreationExpression
2020-03-30 jensj@google.com [CFE] Add api to get language version for uri
2020-03-30 johnniwinther@google.com [cfe] Don't include member signature in id testing by default.
2020-03-30 johnniwinther@google.com [kernel] Make verbose qualified names conditional in toStringInternal
2020-03-30 devoncarew@google.com [dartdev] test the dartdev analyze --fatal-warnings option
2020-03-30 brianwilkerson@google.com Enable omit_local_variable_types in analyzer_plugin
2020-03-30 brianwilkerson@google.com Enable omit_loval_variable_types in analysis_server_client
2020-03-30 brianwilkerson@google.com Enable omit_local_variable_types in analysis_server
2020-03-30 keertip@google.com Add guard code for exceptions from ResourceProvider when reading contents.
2020-03-29 scheglov@google.com Fix the result type of binary expression with the left TypeParameter extends num type.
2020-03-28 scheglov@google.com Fix for creating a setter when the target is in a part without a library.
2020-03-28 brianwilkerson@google.com Remove the need for a --corpus flag from completion_metrics
2020-03-28 brianwilkerson@google.com Remove the need for a --corpus flag from relevance_metrics
2020-03-28 brianwilkerson@google.com Remove an unused variable in AstBuilder
2020-03-28 brianwilkerson@google.com Sort non-generated files in analyis_server and add a test to ensure they stay that way
2020-03-28 scheglov@google.com Add LibraryElement.languageVersionMajor/Minor
2020-03-28 scheglov@google.com Report exceptions with the file content for getResult().
2020-03-28 scheglov@google.com Fix crash in index when the invoked element is multiply defined.
2020-03-28 eernst@google.com Add implementation of several parts of non-function type aliases
2020-03-28 johnniwinther@google.com [cfe] Groups standard tests in update_expectations.dart
2020-03-28 sra@google.com [dart2js] Specialize is- and as- tests for nullable types
2020-03-28 rmacnak@google.com [vm] Do not allocate when evaluating arguments to StorePointer.
2020-03-28 rmacnak@google.com [vm] Fix some data races with profiler samples.
2020-03-28 alexmarkov@google.com Revert "[analyzer] Remove deprecated language version API"
2020-03-27 nshahan@google.com [ddc] Cleanup cast in dart:_runtime lib
2020-03-27 brianwilkerson@google.com New relevance values for UriContributor
2020-03-27 brianwilkerson@google.com New relevance values for KeywordContributor
2020-03-27 brianwilkerson@google.com New relevance values for VariableNameContributor
2020-03-27 paulberry@google.com Migration: don't use union edges for field formal parameters
2020-03-27 rmacnak@google.com [vm] Fix memory leak in profiler when some samples are in native functions without a dynamic symbol.
2020-03-27 bkonyi@google.com [ package:dds ] Fixed smoke_test.dart which was unable to launch smoke.dart due to use of a relative path.
2020-03-27 zichangguo@google.com [dart:io] Fix parsing the response of the HTTP connect method
2020-03-27 mfairhurst@google.com [nnbd_migration] Add confirm dialog to "apply migration" button
2020-03-27 rmacnak@google.com [test] Update use of Null as a bottom type to Never.
2020-03-27 eernst@google.com Added new tests.
2020-03-27 alexmarkov@google.com [vm/nnbd/aot/tfa] Support NNBD strong mode in type flow analysis
2020-03-27 mfairhurst@google.com [analyzer] Remove deprecated language version API
2020-03-27 brianwilkerson@google.com Update relevance computations in LocalReferenceContributor
2020-03-27 brianwilkerson@google.com Update relevance values for LocalLibraryContributor and ImportedReferenceContributor
2020-03-27 sigurdm@google.com Bump pub version
2020-03-27 sigmund@google.com [dart2js] Update test-matrix to specify the libraries.json to dart2js batch runner
2020-03-27 jcollins@google.com Update dartdoc to 0.30.3.
2020-03-27 alexmarkov@google.com [vm/nnbd] Fix marking static fields as late
2020-03-27 scheglov@google.com Fix for completion in formal parameters of GenericFunctionType.
2020-03-27 mfairhurst@google.com [nnbd_migration] Add a "rerun from sources" button.
2020-03-27 mfairhurst@google.com Revert "[analyzer] Copy result of allSupertypes for now."
2020-03-27 scheglov@google.com Merge types during instance member inference.
2020-03-27 scheglov@google.com Catch linking exceptions and include the cycle file contents.
2020-03-27 johnniwinther@google.com [cfe] Handle throw in return type inference
2020-03-27 alexmarkov@google.com [vm/aot/tfa] Fix tracking of parameters in async_op closures
2020-03-27 zichangguo@google.com Reland "[dart:io] Fix hanging on zero-length datagram"
2020-03-27 athom@google.com [infra] Update checked-in SDKs to 2.8.0-dev.18.0
2020-03-27 johnniwinther@google.com [cfe] Add tool for updating all id-tests and expectation tests
2020-03-27 athom@google.com [homebrew] Add support for the beta channel formula
2020-03-27 brianwilkerson@google.com Sort files in analysis_server_client and analyzer_plugin and add tests to keep them that way
2020-03-27 askesc@google.com [benchmark] Benchmark for UTF-8 decoding with typical data.
2020-03-27 jensj@google.com [parser] Change recovery for constructor; report errors in bad constructors
2020-03-27 johnniwinther@google.com [cfe] Use legacy erasure before argument inference
2020-03-27 jensj@google.com [kernel] Polish toString implementation on AST nodes
2020-03-27 sra@google.com [dart2js] Print non-minified init object as multiline
2020-03-27 karlklose@google.com [infra] Handle test steps with no tested configuration
2020-03-27 zichangguo@google.com [dart:io] remove available at _NativeSocket::Read
2020-03-27 nbosch@google.com Remove a stale TODO comment
2020-03-27 rnystrom@google.com Add other breaking changes to CHANGELOG.
2020-03-27 liama@google.com [nnbd/test] Fix tests that are failing in strong mode
2020-03-26 rnystrom@google.com Fix Markdown link in CHANGELOG and remove duplicate entry.
2020-03-26 brianwilkerson@google.com Compute new relevance in LocalConstructorContributor
2020-03-26 kevmoo@google.com DEPS: remove references to pkg:package_resolver
2020-03-26 jcollins@google.com Add a way for analysis_server to open communication via a IsolateChannel.
2020-03-26 scheglov@google.com Use NNBD_TOP_MERGE to combine signatures of the inherited members.
2020-03-26 nshahan@google.com [ddc] Update types in JSArray operations
2020-03-26 srawlins@google.com Migrator: Add an auth token for the preview site
2020-03-26 dacoharkes@google.com [vm] Add Reachability Fence Instruction
2020-03-26 sra@google.com [benchmark] Make BigIntPrintParse be NNBD-agnostic
2020-03-26 rnystrom@google.com Bump the SDK constraint on dart_internal to permit Dart 2.8.0.
2020-03-26 kevmoo@google.com Update changelog with dart2js --package-root removal
2020-03-26 alexmarkov@google.com [vm/corelib] Specify types explicitly in convert_patch.dart
2020-03-26 scheglov@google.com Update checkForWrongTypeParameterVarianceInMethod(), fix NPE.
2020-03-26 mfairhurst@google.com [analyzer] Copy result of allSupertypes for now.
2020-03-26 scheglov@google.com Add  more data to debug crash in buildExportNamespace().
2020-03-26 scheglov@google.com Fix for crash when FieldFormalParameter in a local function has annotations.
2020-03-26 bkonyi@google.com [ VM / DartDev ] Disable DartDev for the 2.8 release
2020-03-26 kevmoo@google.com Remove unused package-root option and configuration from dart2js
2020-03-26 srujzs@google.com [dart:html] Add nullability to EventTarget conversion
2020-03-26 kevmoo@google.com DEPS: Bring in latest pub
2020-03-26 dacoharkes@google.com [vm/ffi] Mark Struct as entrypoint
2020-03-26 jensj@google.com [analyzer] Sort entries in error.dart and syntactic_errors.dart
2020-03-26 karlklose@google.com [infra] pkg/smith: custom test runner steps are test steps

https://skia.googlesource.com/skia.git/+log/5b11a58c6297..e9bc857b39c2

git log 5b11a58c6297..e9bc857b39c2 --date=short --first-parent --format='%ad %ae %s'
2020-03-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/angle2 f2bee3043a5e..1b2dd6f92a6b (18 commits)
2020-03-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll ../src 2cb42d2f8146..af1924a67aab (483 commits)
2020-03-30 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 3ca41df3d3ba..1c29477aa06e (9 commits)
2020-03-29 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update SKP version
2020-03-29 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go Deps

Created with:
  gclient setdep -r src/third_party/skia@e9bc857b39c2

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC michaelludwig@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: michaelludwig@google.com

* Fix z-index leak. Add test for canvas reuse
* add regression test
* update golden locks
* fix analysis errors

https://skia.googlesource.com/skia.git/+log/7345d88277c4..5b11a58c6297

git log 7345d88277c4..5b11a58c6297 --date=short --first-parent --format='%ad %ae %s'
2020-03-28 mtklein@google.com skvm::Builder friendliness improvements
2020-03-28 skia-recreate-skps@skia-swarming-bots.iam.gserviceaccount.com Update Go Deps
2020-03-27 bungeman@google.com Fix gcc 9 warnings.
2020-03-27 bsalomon@google.com Rename SkColorTypeComponentFlags to SkColorChannelFlags.
2020-03-27 reed@google.com all colorfilters but RT converted to skvm
2020-03-27 egdaniel@google.com Add GrD3DPipelineState class and setup vertex input information.
2020-03-27 reed@google.com onProgram for SkGaussianColorFilter, plus gm and bench
2020-03-27 csmartdalton@google.com Rename TessellatingPathRendererTests.cpp -> "Triangulating"
2020-03-27 skia-autoroll@skia-public.iam.gserviceaccount.com Roll third_party/externals/swiftshader 02e15b249b12..3ca41df3d3ba (10 commits)
2020-03-27 egdaniel@google.com Remove some unused 3 byte vertex attrib types.
2020-03-27 robertphillips@google.com Make the distanceFieldAdjustTable a static singleton
2020-03-27 jvanverth@google.com Minor fixes for D3D build.
2020-03-27 bungeman@google.com Fix gcc9 warning around size of memset.
2020-03-27 csmartdalton@google.com Rename GrGpuTessellationPathRenderer to GrTessellationPathRenderer
2020-03-27 nifong@google.com Remove deprecated functions
2020-03-27 reed@google.com onProgram for overdraw-colorfilter
2020-03-27 bsalomon@google.com Remove texture swizzle from GrSurfaceProxy.
2020-03-27 bsalomon@google.com Fix TODO SkImage_GpuBase to check SkColorInfo and not a fake SkImageInfo

Created with:
  gclient setdep -r src/third_party/skia@5b11a58c6297

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC robertphillips@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: robertphillips@google.com

https://skia.googlesource.com/skia.git/+log/385de38b272f..7345d88277c4

git log 385de38b272f..7345d88277c4 --date=short --first-parent --format='%ad %ae %s'
2020-03-27 bungeman@google.com gn format gn/BUILD.gn
2020-03-27 brianosman@google.com Re-generate source from FP files after clang-format change
2020-03-27 brianosman@google.com Remove arbitrary limit on number of composed color filters
2020-03-27 brianosman@google.com Remove GrSRGBEffect
2020-03-27 brianosman@google.com Disable BinPackParameters in .clang-format
2020-03-27 bungeman@google.com Add back deprecated warnings.
2020-03-27 phanm@google.com Add experimental support for svg text tag.
2020-03-27 robertphillips@google.com Have GrFillRRectOp make use of the GrSimpleMeshDrawOpHelper

Created with:
  gclient setdep -r src/third_party/skia@7345d88277c4

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/skia-flutter-autoroll
Please CC robertphillips@google.com on the revert to ensure that a human
is aware of the problem.

To report a problem with the AutoRoller itself, please file a bug:
https://bugs.chromium.org/p/skia/issues/entry?template=Autoroller+Bug

Documentation for the AutoRoller is here:
https://skia.googlesource.com/buildbot/+/master/autoroll/README.md

Bug: None
Tbr: robertphillips@google.com

* change chrome version

* change chrome version

* changing the integration tests to show errors. The drive file is reduced to nothing now

* adding more to readme

* rebase to master and removing unused import

* changing readme