Rolls rapidjson forward to the next mirrored version. This is needed to
pick up fixes to building with clang on Windows, to support
https://github.com/flutter/flutter/issues/16256.

A number of POSIX methods were renamed on Windows to match standards
requirements, giving deprecation warnings when calling strdup on Windows.
This adds a wrapper, to allow calling _strdup on Windows instead.

Part of #16256

Compiling with clang on Windows fails here with a warning about implicit
cast from function pointer to object pointer. Rather than disable that
warning, this makes it an explicit cast. Since this is just test output,
it's not critical that this be a completely safe operation.

Part of #16256

Picks up the change to allow manually enabling clang for Windows. Not
yet supported by the GN wrapper script.

Part of https://github.com/flutter/flutter/issues/16256

Roll fuchsia/sdk/core/mac-amd64 from ubThi... to fvWgE...

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-mac-sdk-flutter-engine
Please CC  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

Targeted suppression of some deprecation warnings that are build errors under
clang:
- Ignore the deprecation of codecvt's unicode conversion until we decide on
  a replacement strategy.
- Allow the deprecated posix names of functions in third_party/txt.

Part of https://github.com/flutter/flutter/issues/16256

To give more flexibility in scheduling, we change the number of frames
in flight we can have at one time to 3. We also introduce an offset from
VSync that Flutter can use to begin its work at. It is currently set at
0ms, matching previous behavior.

* fix bad reference to maxDiffRatePercent

* back to 10%

* Fix transform order in clipStack replay

Clang has different warning settings, so catches different issues than
the VS compile. This fixes various minor issues caught by clang.

Part of https://github.com/flutter/flutter/issues/16256

The license output has a latent change that shows up for any change that
forces a re-run, due to the tonic move. This updates the output to
account for that.

No change in behavior expected. We have 2 frames in flight as before. By switching to Present2 and specifying a kMaxFramesInFlight however, we allow us greater flexibility to change how Flutter schedules its frames.

This change also adds tests for SessionConnection and VsyncRecorder.

https://dart.googlesource.com/sdk.git/+log/48808f7dce81..34893faa6079

git log 48808f7dce81..34893faa6079 --date=short --first-parent --format='%ad %ae %s'
2020-02-05 scheglov@google.com Use DartType.getDisplayString() instead of toString().
2020-02-05 scheglov@google.com Use DartType.getDisplayString() instead of toString().
2020-02-05 scheglov@google.com Use DartType.getDisplayString() instead of toString().
2020-02-05 johnniwinther@google.com [cfe] Implement weak mode constants semantics
2020-02-05 bkonyi@google.com Revert "[ VM / Service ] Added `getClientName`, `setClientName` and `requireResumeApproval` RPCs"
2020-02-05 fishythefish@google.com [dart2js] Remove typedefs from backend.
2020-02-05 nshahan@google.com Revert "[tests] Add tests for generic function type bounds with null safety"

Created with:
  gclient setdep -r src/third_party/dart@34893faa6079

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

Roll fuchsia/sdk/core/mac-amd64 from Ke00Y... to ubThi...

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-mac-sdk-flutter-engine
Please CC  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

https://dart.googlesource.com/sdk.git/+log/68e904e444dc..48808f7dce81

git log 68e904e444dc..48808f7dce81 --date=short --first-parent --format='%ad %ae %s'
2020-02-05 bkonyi@google.com [ VM / Service ] Added `getClientName`, `setClientName` and `requireResumeApproval` RPCs
2020-02-04 vsm@google.com [dartdevc,nnbd] fix type errors in dart:_interceptors
2020-02-04 asiva@google.com [VM/libraries] - Fix issues in ported patch files that cause dart2js to fail (https://github.com/dart-lang/sdk/issues/40463)
2020-02-04 sigmund@google.com [ddc,dart2js] remove web patches for dart:cli
2020-02-04 rmacnak@google.com [vm] Remove FLAG_support_service and FLAG_support_reload, superseded by PRODUCT define.
2020-02-04 nshahan@google.com [dartdevc] Enforce more pedantic v1.9.0 lints and cleanup violations
2020-02-04 nshahan@google.com [tests] Add tests for generic function type bounds with null safety
2020-02-04 paulberry@google.com Migration: rework how ElementTypeProvider overrides element types.
2020-02-04 paulberry@google.com Sort declarations in assignment_expression_resolver.dart
2020-02-04 bkonyi@google.com [ DartFuzz ] Quality of life improvements in log output
2020-02-04 eernst@google.com Adjusted language/assign/to_type_test.dart to avoid irrelevant nnbd type error.
2020-02-04 devoncarew@google.com [migration tool] convert the javascript code in the migration tool to dart
2020-02-04 jcollins@google.com Do not require --enable-asserts for test_assertOnPathOutsidePackage.
2020-02-04 scheglov@google.com Remove 'withNullability' from TypeImpl.toString()
2020-02-04 kustermann@google.com [vm/concurrency] Speed up isolate communication via normal snapshotting
2020-02-04 regis@google.com [VM/nnbd] Fix canonicalization of type 'Never' (fixes #40249).
2020-02-04 jwren@google.com Refactor the CompletionMetricsComputer class into three classes: a subclass and two concrete classes, AbstractCompletionMetricsComputer, CompletionCoverageMetrics and RelevanceAnalyzerMetrics.

Created with:
  gclient setdep -r src/third_party/dart@48808f7dce81

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

There were two variants of string/wstring conversion utils, one using
codecvt_utf8 and the other using codecvt_utf8_utf16. We want the latter,
since we want to be using UTF-16, not UCS2.

https://dart.googlesource.com/sdk.git/+log/3414b5167554..68e904e444dc

git log 3414b5167554..68e904e444dc --date=short --first-parent --format='%ad %ae %s'
2020-02-04 rnystrom@google.com Migrate language_2/abstract to NNBD.
2020-02-04 jcollins@google.com Add a 'run' feature to MultiFutureTracker.
2020-02-04 kustermann@google.com [infa] Respect --sanitizer flag in tools/test.py when running GN
2020-02-04 rmacnak@google.com [vm] Speed-up the stack overflow check as used by reload stress testing.
2020-02-04 scheglov@google.com Issue 40392. Report SWITCH_CASE_COMPLETES_NORMALLY when switch/case completes normally.
2020-02-04 sstrickl@google.com Revert "[vm/aot] Remove object wrapping of bare instructions for AOT snapshots."
2020-02-04 sstrickl@google.com Revert "[gardening] Fix assert failure on (sim)arm_x64 due to 7475c63."
2020-02-04 scheglov@google.com Extract test for CASE_EXPRESSION_TYPE_IMPLEMENTS_EQUALS.
2020-02-04 asiva@google.com [VM/library] Fix signature of waitFor to account for potential null return value. This should fix the breakage in the NNBD on test standalone/io/issue_32052_test
2020-02-04 liama@google.com [test] Run late field tests in optimised mode
2020-02-04 sstrickl@google.com [gardening] Fix assert failure on (sim)arm_x64 due to 7475c63.
2020-02-04 rnystrom@google.com Migrate language_2/argument to NNBD.
2020-02-04 jensj@google.com [CFE] Parser test for class called late and required
2020-02-04 dmitryas@google.com [cfe] Disallow default List constructor invocations in NNBD
2020-02-04 johnniwinther@google.com [cfe] Update tests to show that inc/dec shorting is supported
2020-02-04 victor.agnez@hotmail.com [vm] Allow unboxed integer fields in AOT
2020-02-04 dmitryas@google.com [cfe] Disallow late final fields and const constructors

Created with:
  gclient setdep -r src/third_party/dart@68e904e444dc

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

This allows for targets to depend on the assets generated by the test_fixtures target.

Our tests depend on explicit latching to verify assertion are checked. If a test
does not respond for a long time, it has probably encoutered a deadlock. Instead
of waiting for the test runner to detect this, apply a very aggresive timeout on
a per test basis.

Co-authored-by: NDavid Worsham <arbreng@gmail.com>