Fixed glitch in NuPlayer when surface size changes

When VideoView calls setFixedSize(), the SurfaceControl.setSize()
gets called from WindowStateAnimator.setSurfaceBoundariesLocked,
but setSurfaceBoundariesLocked only updates the size, not the
transform matrix/scaling factor.

The after some time, SurfaceControl.setMatrix gets called by
WindowStateAnimator.prepareSurfaceLocked. It updates both size and
matrix (size update is skipped since it's already updated by
setSurfaceBoundariesLocked earlier). This corrects the transform
matrix, and restores video rendering.

We now call setMatrix() in setSurfaceBoundariesLocked() to avoid
the glitch.

Bug: 18773834
Change-Id: I5e8de38495fabe54eefa8bd3003627d11392c0f1