9301 Refactor: move Task Queue to its own class (cla: yes)

9302 Handle Fuchsia SDK in license tool + roll SDK (cla: yes)

9303 Added class docstrings for classes inside of shell/common. (cla: yes)

9304 Decorate UIApplicationDelegate wrappers with matching UIKit deprecation (affects: dev experience, cla: yes, platform-ios)

9306 When running in AOT modes create a flutter_assets directory that can be used as the bundle path (cla: yes)

9313 [macos] Adds clipboard string read/write support to macOS (cla: yes)

9314 Avoid using std::unary_function. (cla: yes)

9315 Only build embedder unit tests for host builds (cla: yes)