This could cause the draw() code of views to be invoked too often
or worse, called with the wrong canvas. For instance, a view backed
by a software layer could get its draw() method called to record a
display list. Using a software layer is the recommended way to use
drawing operations not supported in hardware. Since we would
sometimes call the draw() method with the hardware backend anyway,
the app could crash by executing an unsupported operation.
Change-Id: Ib5f9a3a4c6f3efff5e0162ecd73d2dffe06e30a6
2a9fa89643