Fix Skia assertions where we were allowing immutable bitmaps to be written to.
Fix Skia assertions where we were allowing immutable bitmaps to be written to.

bug: 7092330
Change-Id: I4a9d1d299244d46172562080c56c8360f5e4af02

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base