9495 fix build breakage on PlatformViews.mm (cla: yes)

9501 [android] External textures must be rescaled to fill the canvas (cla: yes)

9503 Improve caching limits for Skia (cla: yes)

9506 Synchronize main thread and gpu thread for first render frame (cla: yes)

9507 Revert Skia version to d8f79a27b06b5bce7a27f89ce2d43d39f8c058dc (cla: yes)

9508 Support image filter on paint (cla: yes)

9509 Roll Fuchsia SDK to latest (cla: yes)