This fixes issue with compilation trace buffer getting released upon return from VM code to Dart code, before it gets change to save to a file in natives.dart saveCompilationTrace().

The is a follow up of https://github.com/flutter/engine/pull/5853

* Rename clip mode to clip behavior

So we're consistent across flutter/flutter and flutter/engine

* Clang format

* Remove trailing white spaces

* Fix clang-format

Reverts flutter/engine#5740

For flutter/flutter#18057

Fixes https://github.com/flutter/flutter/issues/19214

So our future pull requests won't be polluted by the white space changes.

This is a reland of #5638. We removed the restoreToCount, made doAntiAlias named, and updated the comments.

This reverts commit a2bf8059.

Reason for revert: need to fix several things including the framework test in order to unblock the engine roll.

TBR: @matthew-carroll 

This would enable us to solve https://github.com/flutter/flutter/issues/18057

For consistency with the rest of dart:ui, check required parameters with
assert(param != null) rather than throwing ArgumentError. ArgumentError
is typically reserved for checking the validity of non-null args -- e.g.
that a list has the required number of elements.

See https://github.com/flutter/flutter/issues/18728

Skia is moving ports/SkFontMgr.h to core/SkFontMgr.h. The existing
ports/SkFontMgr.h is now just a forwarding header to keep users working
through the transition. Update includes to point to the new location.

See https://github.com/flutter/flutter/issues/9184

Toward no-copy loading of kernel.

Part of fixing https://bugs.chromium.org/p/skia/issues/detail?id=7741

Fixes https://github.com/flutter/flutter/issues/9184

This reverts commit 15b76dd3.

Previously the engine would load all embedded fonts listed in the app's
font manifest during startup.  This change creates a Skia font manager that
is backed by the engine's AssetManager and can load embedded font assets
on demand.

* Reland "Added IsolateNameServer functionality (#5410)"

This reverts commit c3976b3c.

* Fixed issue with isolate_name_server_test which caused test to timeout

* Disabled thread_annotations on Android as they aren't supported in the
NDK headers for std::mutex. Readded thread annotations to
IsolateNameServer.

This reverts commit 61a2d129.