* Roll dart to version c6254163dc7a5f704d7609af65e4650ef0550ccd

This roll contains the following changes :
c6254163dc Fix source filter in built rule.
a97ddf8ce1 [vm/bytecode] Fix sporadic crashes when running with bytecode.
cf007d1f40 [infra] Add missing entries to the test matrix
9db63ee729 [vm/bytecode] Set 'TypeEnvironment.thisType' when generating bytecode
9c75ab7aa9 More common fasta/analyzer parser error codes
a712a910cf Revise class and mixin header recovery
588b0d1222 make pubspec file path to absolute
74f2348941 (fixdeps) [dart/fuzzer] DartFuzz Improvements
291f8abff8 More hint cleanup in analyzer
1cd2fc5883 [Gardening] Mark pause_on_unhandled_async_exceptions_test also flaky on kernel
1af136987b [infra] Prepare test matrix for the Dart 1 removal
0cc7993ee3 Clean up a couple of hints in analyzer code
22da7488ac [Gardening] Mark two service tests as passing on dartk-windows
def9d4c405 Cleanup endMethod and endFactoryMethod parameter recovery
46983c2de9 [vm/aot/tfa] Detect if a method/setter is called from this
2a6b566ca2 Move byte store to package:analyzer
45cb0815bc Move PerformanceLogger to package:analyzer
3a2308f5c2 Move jenkins_smi_hash to package:analyzer
ec4663ee5c Don't build runtime_kernel in benchmarks.
6b547e2683 Convert analyzer to use onDiagnostics
218d30e26a Skip source files attributed to 'dart:' libraries when writing a dep file.
45a5bc063a Mark the Script.source field as nullable.
ff3992b9ea [test tool] Pass --packages to gen_kernel
644342a6e6 Prepare for analyzer 0.33.0 publish.
cf48bad128 bump linter to 0.1.67
097e716694 [vm/bytecode] Update test status
69358a8755 [vm] Remove Dart_IsSnapshot and Dart_IsDart2Snapshot.
248a15f994 Upgrade dartdoc and dependencies for 0.22.0.
1085dd13d1 Use separate 'type index' for mixin, some nodes might be unresolved.
854720a099 Fix build rule.
878779e1a2 Fix test and add TODO for others that need updating
3daa63bc4c Revert OverrideVerifier back to the old InheritanceManager.
aa25872027 [vm] Fix pkg/vm/tool/precompiler2.
ab3ef0914c Allow "yield" as label
f529ab10f0 Allow "operator" as a static method name
cbf97be4e7 [fuchsia] Switch to new fdio API names
aedf5127bd [vm] Enable bump allocation scope for kernel loader
57f8542ea5 Fix warnings in analyzer package.
a33c1a1c17 [vm] Use proper lookup to find constructor during rebinding.
270fd8e4a8 [vm/aot] Handle annotations on parameters in tree shaker and constant evaluator
6d0601a72b [vm/bytecode] Add bytecodes for int operations and '== null'
10b1b35418 Update changelog for override check fixes
eacf720d2b Functions to demangle mixin application class names
bb2775b16a Only perform override check on declared members.
d3bd06d4e8 Check class interface requirements using override check code.
2dfe46fba2 Additional work on MOVE_FILE and associated tests
6c5326ae80 [vm] Fix issue with debugging generated code within RR.
c57a844841 Characterize behavior of FunctionTypeImpl.forTypedef when typeArguments not provided.
ed42aab273 Move source.dart to package:analyzer
82da68f3f5 Move api_signature to package:analyzer
829ba8a118 Remove unused file_repository.dart
b8cef2cefe Move flat_buffers to package:analyzer
27b17c76d8 Remove unused uri_resolver.dart
29d57107dd Move dependency_walker to package:analyzer
62e67d7277 Adjusted instantiate-to-bound.md such that it covers type aliases
440b9c61a7 Handle duplicated declaration used as prefix.
eb0ec965e3 Move codegen/tools.dart to package:analyzer
fd9a2cb510 Remove unused stuff
bc49637085 Convert package:dev_compiler to use onDiagnostic
44c6312df8 Consolidate VM dependencies on front_end
b628a62aa8 Remove ConstantValueComputer and DirectedGraph.
bd7b776bb4 Fix more quick fix tests
621c41f091 Add mixin support to InterfaceTypeImpl.isMoreSpecificThan.
d2e08e4952 [vm] Disable concurrent sweeping when --deterministic is set.
30aa464f77 [VM] Remove 'corelib' and 'dart-io' sources generation into C++ arrays
abe93563c4 [vm, service] Enable _collectAllGarbage in release mode.
80db08809c Pass InheritanceManager2 into resolver, use for BinaryExpression.
3ef994c287 Some clean ups in InheritanceOverrideVerifier.
4053ff96ec [vm] Fix --print-instructions-sizes-to in debug mode.
edd86ef7a1 Generate quick fix for await in non-async (issue 34647)
49f36b0b2d Reland "Test that the result of instantiate-to-bounds is appropriately checked for super-boundedness."
0016f80467 [dart/fuzzer] Pick execution modes at random by default
4df3626d19 Remove support for (non)nullable types from Analyzer.
93c5dcd00a [infra] Add fuzz testing builder to the test matrix
5cbb1bcdf9 Force lf-lineendings for .dart-files.

https://skia.googlesource.com/skia.git/+log/d95303e10cbc..4302eb9a6e14


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Remove touch mapper and respect the UITouch phase when calculating the pointer data change type. (#6430)

The touch mapper was a relic of a time when the pointer IDs had to be less
than 16. Not respecting the touch phase is getting in the way of clients that
fake their own touches. Turns out the AppDelegate also like to fake touches to
simulate status bar events. Now, except in cases where there is a specific
override in place, the UI touch phase is respected.

https://skia.googlesource.com/skia.git/+log/66a973493468..d95303e10cbc


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https://skia.googlesource.com/skia.git/+log/7b7805581733..66a973493468


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https://skia.googlesource.com/skia.git/+log/4442e3138927..7b7805581733


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https://skia.googlesource.com/skia.git/+log/4dd17156c6e4..4442e3138927


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https://skia.googlesource.com/skia.git/+log/8841085abeb9..4dd17156c6e4


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Revert commit 360d4466.

This allows us to figure out from looking at a trace if an
|Engine::NotifyIdle| call went beyond its deadline

https://skia.googlesource.com/skia.git/+log/4504a652c071..8841085abeb9


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Also adds //flutter/benchmarking which, similar to //flutter/testing, allows for the creation of a benchmarking executable. This is also the target that contains benchmarking utilities.

* Fix ideographic baseline to match spec.

https://skia.googlesource.com/skia.git/+log/bfa76f20bfcf..4504a652c071


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https://skia.googlesource.com/skia.git/+log/08417bccf256..bfa76f20bfcf


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Fixes https://github.com/flutter/flutter/issues/22478

https://skia.googlesource.com/skia.git/+log/b627af80e3a4..08417bccf256


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https://skia.googlesource.com/skia.git/+log/be8193c9313a..b627af80e3a4


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https://skia.googlesource.com/skia.git/+log/deb512045e6a..be8193c9313a


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Reverts flutter/engine#6406

We need to fix the SkiaGPUObject issue of the raster cache SkImage before merging this PR.

https://skia.googlesource.com/skia.git/+log/6719fcc43b1e..deb512045e6a


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This works towards resolving https://github.com/flutter/flutter/issues/19888.

* Dart SDK roll for 2018-10-02 to 72d3798764a374ec50494545c2e9f564e3ee7f17

72d3798764 Improved completion support for mixins
097e8d86b8 Use context severity when calling onProblem
002a3e090d Improve error message on unresolved constructor redirections
a074a87b25 Convert more analyzer tests to use ResourceProviderMixin
a1ebe68359 Change how compile-time NSM is handled
0b48c4a6ad [gardening] Mark appjit_determinism_test flaky on IA32
ff51edf6e2 [infra] Update checked in SDKs to 2.1.0-dev.6.0
b8c831592a Record superInterface and use it for OverrideVerifier.
158290349a Reject diagnostics with missing arguments
df32b2ae49 Ignore synthetic tokens when compiling bodies
f3047f1b9c Improve diagnostics with constructor names
1972ad92d7 Related information (context) may be null
248954117a Consolidate dart2js front-end dependencies
4306245660 Address review comments from 63144 and 74640
49e521c55b [build] Forward load limit from build.py to Ninja.
07a8496919 [VM] Allow for Dart_SetVMFlags to be called again after Dart_Cleanup
d70b0fa3be Revert "Test that the result of instantiate-to-bounds is appropriately checked for super-boundedness."
7ca2f56112 Stop using and deprecate InheritanceManager.getMembersInheritedFromInterfaces().
7419667d67 Test that the result of instantiate-to-bounds is appropriately checked for super-boundedness.
07a2130724 [vm] Set translation helper allocation space in kernel loader
223055242f [vm] Disable bump allocation scope in kernel loader
f5135c6e86 Don't recurse into arguments of constant InstanceCreationExpression while verifying.
32af1be0a4 Check type arguments against bounds when instantiating a typedef.
e90f1f21b8 Remove unused response codes and deprecate an unimplemented request
e98d5d8cc1 [vm] Wait for marker task to finish in BumpAllocateScope
bdeb6a3f95 [dart/fuzzer] Remove use of PATH in env
dd2e6afd5e Add test for InheritanceManager2
f7f31efab0 Disable the reading of a UUID during training
64f02226b3 Stop using InheritanceManager.getMembersInheritedFromClasses().
76bfa425bb bump to linter 0.1.66
e4671346ac Fix build mode to convert input paths to absolute and normalized before giving them to Analyzer.
765a78d44e Fix AST summarizer rules when to store variable initializer.
b6368c78fa Extract PhysicalResourceProvider watch tests and mark them flaky.
1dfdcf3593 [vm] Add bump allocation scope
a1951238f3 [vm] Remove name conflict checks from class finalization
2723fcfb82 Remove more dead code from server
ce8a5ffab2 Remove remaining definitions of EMPTY_LIST in server
9083b116f8 InheritanceManager does not produce errors, don't ask it.
645fbc8a3f Add CompilerOptions.onDiagnostic
6361d9e1c3 Update status for flaky product-mode vm test
ed6d7e23f1 Fix build failure introduced in https://dart-review.googlesource.com/c/sdk/+/77013
0461df2e22 Remove FileState.fileUri.
10f05f45b9 Remove more dead code from server
5cc9ab02a8 Switch all refactoring to using ResolveResult instead of raw unit.
215e80eb0a Fix Analysis Server tests on Windows bot.
85fb1f3de1 Fix Analyzer tests on Windows bot.
1be151dcce Give LibraryScope to AstRewriteVisitor.
e7e8786670 Replace MockSDK in analyzer_plugin to fix its tests on Windows.
24208552ff Fix analyzer_cli tests on Windows.
5bcf91d973 Remove some dead code
fc130a0477 Extract ConstantVerifier.
fc96edc1ce Don't use AstRewriteVisitor in resynthesizer, build InstanceCreationExpression as we build expressions.
25c659934a Change ResourceUriResolver to accept any file URI.
6c577f0620 Deprecate Element.isVirtual
5db21a7998 Tentatively re-enable PhysicalResourceProviderTest.
c78f67cc7e [vm/aot] Use TFA to detect dynamic, non-this and tear-off uses
07852532e3 [ VM ] Additional cleanup in Dart_Initialize and Dart_Cleanup
41a875f420 Fix (super)mixins issues
da3e844cac Fix potential cast exceptions
1bceca91b0 Remove the 'name' constructor parameter from CompilationUnitElementImpl()
4a51268890 [gen_snapshot] Restore support for --snapshot_kind=vm-aot-assembly; update docs.

* Dart SDK roll for 2018-10-02

d2c5a24fd9 Recognize mixins as subtypes of their superclass constraints in hint generation (issue 34633)
0804245caa [vm] Make filtering in Heap::RecordAfterGC consistent with ServiceEvent::ServiceEvent.

To make the PR minimal, we currently only share the engine layer when `pushPhysicalShape` (for Fuchsia) or `pushOffset` (for `RepaintBoundary` and `Opacity`) are called. They should be sufficient for our short-term perf goal. In the future, we can incrementally share more engine layers with the framework.

https://github.com/flutter/flutter/issues/21756

https://skia.googlesource.com/skia.git/+log/cc4dbfcfbd8a..6719fcc43b1e


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* Let GetRectsForRange provide more detailed/nuanced metrics through RectStyle enum.