12703 [flutter_runner] Replace read exec calls on Fuchsia to adhere to Verified Execution semantics (cla: yes)

12706 Check for a null input method subtype (cla: yes)

12707 Reland “Add iOS platform view mutation XCUITests to the scenario app(#11652)” (cla: yes)

12708 Cleanup: Turned on NS_ASSUME_NONNULL_BEGIN for FlutterViewController. (CQ+1, cla: yes)

12710 Set transparent background in textarea elements (affects: text input, cla: yes, platform-web)

12712 Support correct keymap for web (accessibility, affects: text input, cla: yes, platform-web)

12725 Expanded channel buffer resize to method channels. (cla: yes)