12222 Do not generate kernel platform files on topaz tree

12226 [web_ui] add missing dispose handler for MethodCalls to flutter/platform_view

12227 [web_ui] PersistedPlatformView attribute update handling to enable resizing

12228 pin and auto-install chrome version

12229 Improve check to render (or not) a DRRect when inner falls outside of outer on RecordingCanvas

12249 Editable text fix

12253 Implement Base32Decode

12256 Do not assume Platform.script is a Dart source file during training.

12257 Re-enable ThreadChecker and fix associated failures

12258 Refactor and polish the ‘felt’ tool