* 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
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

* 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>

* adding autofill hints map from flutter values to the browser values, which will  be used by the web engine:

* removing unused reverse map

* addressing reviewer comments

* changing licences

Fixes https://github.com/flutter/flutter/issues/55219

* Speedup color to css string 25%

This change converts all Float64List matrices to Float32List at the dart:ui interface boundary. Internally, it only uses Float32List. Float32List requires less memory and is orders of magnitude faster to allocate, and it has sufficient precision as Flutter mobile engine and Skia use 32-bit floats anyway.

This change speeds up frame preroll by 50% on the bench_card_infinite_scroll benchmark.

For more details on Float64Array allocation in JS (which backs Float64List in Dart) see the following:

https://bugs.chromium.org/p/v8/issues/detail?id=9199
https://bugs.chromium.org/p/v8/issues/detail?id=2022

* add scenebuilder submetrics
* Disable Profiler by default