27918 Roll Skia from 134c5f7f690b to 462e18821630 (1 revision) (cla: yes, waiting for tree to go green)

27919 Roll Skia from 462e18821630 to aef5dc78f38a (1 revision) (cla: yes, waiting for tree to go green)

27921 Windows keyboard integration tests and fix a number of issues (cla: yes, platform-windows)

27922 [UWP] Remove 1px offset to make root widget fully shown (cla: yes, waiting for tree to go green, platform-windows)

27924 Fix the SurfaceTexture related crash by replacing the JNI weak global reference with WeakReference (platform-android, cla: yes, waiting for tree to go green, needs tests)