* Roll Dart SDK to 3a422bceb76d6155cab0c728b68f2badad8ff0e9

* Update licences.golden for latest Dart SDK

Add a couple missing newlines.

Not shipped to clients.

Fixes https://github.com/flutter/flutter/issues/7200

Add a getter for flutterView in FlutterActivity. This allows fullscreen flutter apps to extend FlutterActivity and do custom stuff with the flutter view. (#3324)

The API was updated recently so platforms can report memory usage for the
rasterizer to display as an overlay.

The Skia team says these APIs are outdated and should be removed. They
do not appear to have any clients.

Fixes https://github.com/flutter/flutter/issues/7202
Fixes https://github.com/flutter/flutter/issues/7204

Fixes https://github.com/flutter/flutter/issues/7294

Detach the EGL surface from the GPU thread and then destroy it during the FlutterView surfaceDestroyed callback (#3316)

Fixes https://github.com/flutter/flutter/issues/7147

Fixes https://github.com/flutter/flutter/issues/7234

* This allows the tests to add their own FLX files but still use consistent fonts.
* The test fonts are only embedded on the desktop test shells. The option is not available on mobile platforms.
* Right now, all fonts will resolve to the test font. If we want tests to be able to use the fonts they embed in FLX files but use the test font for platform fallbacks, we will need to add font selector fallbacks. I can do this in an another patch. So far, there are no users of this functionality.

Now that the observatory build works in Fuchsia, use dart instead of dart_no_observatory so that dart_no_observatory can be removed from the build.

Decorate kDartWriteProtectCodeArgs with FTL_ALLOW_UNUSED_TYPE since it may not be used in all configurations. (#3302)

Fixes https://github.com/flutter/flutter/issues/7182

FlutterView's host message processing methods are invoked from native code,
and the JNI wrappers will abort the process if the Java side has an uncaught
exception.

Fixes https://github.com/flutter/flutter/issues/7174