12797 add option for bulk-updating screenshots; update screenshots (Work in progress (WIP), cla: yes)

12798 [flutter_runner] Update the cmx files to include TZ support (cla: yes)

12799 Disable EmbedderTest::CanLaunchAndShutdownMultipleTimes. (cla: yes)

12800 Prettify all CMX files (cla: yes)

12801 do not wrap font family name (cla: yes, platform-web)

12802 Build gen_snapshot with a 64-bit host toolchain even if the target platform is 32-bit (cla: yes)

12805 Unbreak Fuchsia unopt builds (cla: yes)

12806 Move initialization into FlutterEngine (cla: yes)