Add a method to hide/show a SurfaceView's surface.
Add a method to hide/show a SurfaceView's surface.

This can be used to move a surface offscreen to avoid the cost of compositing it.
This preserves the window and therefore the OpenGL context when used in h/w
accelerated apps.

Change-Id: I280295376601b17989d0fc8a271af66650016f09

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