In order to implement more detailed animation in Flutter, precise
handling of the rounded corner's radii is necessary. This commit
adds a data structure Radius and updated RRect accordingly.

This is required because boolean values cannot be null.

Fixes https://github.com/flutter/flutter/issues/4972

The code that draws the picture knows more about the picture (and the future)
than we do. This patch gives them a way to hint us about what's going to
happen with the picture in the future.

Recreate the EGL surface after a resize in order to correctly handle screen rotation on Android (#2813)

- [x] Fixes devfs opening too many files.
- [x] Build fixes related to Fuschia support

Only suppress the sampling profiler on Mac/iOS when the engine is in debug mode. Makes the profiler available when using 'flutter run --profile' for iOS. (#2804)

Don't pass the --background-compilation vm flag as it has been enabled by default for quite awhile now.

to CoreText for font fallback selection.

Fixes https://github.com/flutter/flutter/issues/4926

The setup instructions for engine development ask users to run build/install-build-deps-android.sh,
which updates the Android SDK packages listed in android_sdk_extras.json

This process was upgrading the Play Services package to a version that is incompatible
with our build scripts.

Remove dependencies on ui, third_party/mesa and mojo/convertors. Provide simple alternatives. (#2783)

This requires adding a way for platform services (namely SystemChromeImpl) to
listen for activity lifecycle events

Fixes https://github.com/flutter/flutter/issues/4885

Also provide an API for obtaining the path where the app bundle was extracted

- Pick up fix for 64-bit AOT/caching-JIT snapshots.