Prevent NPE in TextureView.getBitmap()
Prevent NPE in TextureView.getBitmap()

This crash could occur when invoking setSurfaceTexture() then getBitmap()
before the View has a chance to be drawn.

Change-Id: I25c55df15750e59b9c916e8f750de2c89718d39e

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