Manual roll of Dart to 03429b20cd67f85d65cc589b529ab8c1a4780912...a53d336b9fd4bbb415d2f1e3f4c653aa107f31c7 (#17971)

dart-lang/sdk@ 03429b20cd (master) Use FuzzyMatcher for Cider completion filtering and sorting.
dart-lang/sdk@ c1edd26d97 Remove the remaining unnecessary awaits from analysis_server
dart-lang/sdk@ f43437cf80 Fix for avoid_types_as_parameter_names in try/catch.
dart-lang/sdk@ 12dcfe63bb Start removing extraneous awaits from server

* change the repo fetch script to recognize candidate versions such as flutter-1.17-candidate.3. Originally the script only accepted branches such as v0.7.3 as valid engine branches.

* addressing reviewer comments: changing the release regular expression

* Batch systemFontChange messages
* Update test for async

GTK uses timestamps in milliseconds, Flutter wants them in microseconds.

This reverts commit a544b45f.

Reverts flutter/engine#17878

This breaks our devicelab tests.

TBR: @flar 

To reproduce:
$ touch foo.c foo.cc foo.cpp foo.h foo.m foo.mm
$ ./ci/format.sh

This will not check any file with clang, as the following command will do a
shell expansion and not find anything in git that matches:
$ git ls-files *.c *.cc *.cpp *.h *.m *.mm

If this roll has caused a breakage, revert this CL and stop the roller
using the controls here:
https://autoroll.skia.org/r/fuchsia-linux-sdk-flutter-engine
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* Fix zIndex removal on reuse
* Move check after append call to simplify

This avoids the possible matrix mismatch between RasterCache::Get and
RasterCacheResult::draw. See
https://github.com/flutter/engine/pull/17790 for an example that tries
to fix an earlier mismatch.

This change converts it from an events that spans a time interval
to an event that occurs at an instant.

We also emit this trace event when there is no lag as opposed to
only when there was a lag to make it monotonous.
Co-authored-by: NKaushik Iska <kaushikiska@google.com>