8084 Move android_sdk_downloader so I can more easily deprecate it (cla: yes)

8085 Remove deprecated libraries from snapshot (cla: yes)

8087 Drop android_sdk_downloader in favor of cipd (cla: yes)

8089 Allow embedders to post tasks onto the render thread. (cla: yes)

8090 Android linter prints to the console by default (cla: yes)

8093 Clarify arguments to FlutterEngineOnVsync. (cla: yes)

8094 Add support for trace counters with variable arguments and instrument the raster cache. (cla: yes)

8095 Integrated AndroidTouchProcessor within the old FlutterView (cla: yes)

8096 Log non-kSuccess returns from embedder API calls. (cla: yes)