It speeds up local development workflow when doing changes to the front end
when ninja automatically rebuilds the frontend_server.dart.snapshot.

The UIDartState is now always owned by the isolate and always freed in
the isolate cleanup callback.

In the isolate shutdown callback, if the isolate being shut down is the
main isolate, the RuntimeController is informed which in turn notifies
the RuntimeHolder and thus the ApplicationControllerImpl. The
ApplicationControllerImpl tears down the whole Flutter application.

This fixes Fuchsia bug: MI4-328

* roll to 09b8c91b696925c6c6a25c35173f2da27abf0fbe

* update licenses

Fixes flutter/flutter#13018

When linear blending was disabled, we started rendering directly to FBO0 again. We can't attach stencil there, and the profile graph code triggers a path that (by default) uses it. This option forces us to use alternate rendering methods.

Note that the graph rendering code is constructing a fairly complex path. It would probably be much faster to render as a simpler series of drawRect calls for each box (which would get batched inside Skia).

This updated the native embedder API in a non-ABI breaking way.

This retains gamut correction (adjusting colors for screens with different capabilities), but does all blending and interpolation with sRGB-encoded values. That matches the behavior expected by most users, as well as the behavior of nearly all other systems. It also greatly simplifies the EGL code.

A future Skia change will make this behavior more of a first-class citizen, so some of these implementation details will change again, but the behavior will not. The bulk of this change (elimination of complication from the GL surface code) is permanent - it's just the SkColorSpaceXformCanvas that will be replaced.

[Android] Allow persisting a FlutterNativeView across activities.

Fixes https://github.com/flutter/flutter/issues/12996

This reverts commit 0b7582e6.

* Roll skia to 0658f7

* Update licenses

Adding Rect.expandToInclude and Rect.longestSide to make the Rect API more symmetric.

Fixes https://github.com/flutter/flutter/issues/12886

Fixes https://github.com/flutter/flutter/issues/12924

A flutter_app target might be declared in a build file alongside some host tool.
The intent of the assertion seemed to be restricting the use of the template to the Fuchsia codebase.

* Roll dart

* Update license hash key, no changes to licenses themselves

With the update to HEAD of the Fuchsia buildtools repo, the new clang
toolchain picked up caused link-time breakage in android x86_64
libFlutter.so builds.

Sample log:
https://build.chromium.org/p/client.flutter/builders/Linux%20Engine/builds/1974/steps/build%20android_debug_x64/logs/stdio

Sample failure:
FAILED: libflutter.so libflutter.so.TOC lib.stripped/libflutter.so
../../third_party/android_tools/ndk/toolchains/x86_64-4.9/prebuilt/linux-x86_64/lib/gcc/x86_64-linux-android/4.9.x/../../../../x86_64-linux-android/bin/ld.gold: error: obj/flutter/shell/platform/android/libflutter/android_context_gl.o: unsupported reloc 42 against global symbol std::__ndk1::num_put<char, std::__ndk1::ostreambuf_iterator<char, std::__ndk1::char_traits<char> > >::id

This reverts commit 8ad42f0d.

* Roll garnet to b3ba6b6d6ab8ef658278cc43c9f839a8a8d1718e

Also includes a buildroot patch to pick up new dependency:
  build/config/fuchsia/sdk.gni

This fixes a build breakage in
garnet/public/lib/fxl/strings/string_view_unittest.cc wherein a variable
'sw5' was declared but the test erroneously tested against 'sw4' from
the previous test.

* Update license script for garnet

Reflects structural changes in directories we do not depend on. This
filters out the following directories in addition to what was already
filtered:
  garnet/drivers
  garnet/packages
  garnet/public/build/
  garnet/public/rust/

* Update licenses

Plumb through Scenic display metrics to use during
Preroll.

Update to moved repository.

Issue https://github.com/flutter/flutter/issues/9998

* Roll Fuchsia buildtools to 85907c59e97527d79bbfdfd849d8e85c24959cc5

This also updates Flutter buildroot to a6e52dbb776c45cc8c57d7143b8eb8b2e762fdfb
which disables -Wtautological-constant-compare temporarily until
https://reviews.llvm.org/D39462 lands in clang. This is in line with
Fuchsia's compiler options.

* Apply clang-format diffs

No logical changes. This applies clang-format from the latest Fuchsia
buildtools to the engine codebase.

On iOS 11 and above, update viewport padding and notify the framework
when changes to safe area insets occur.