Merge "WindowStateAnimator: Hide preserved surface when showing new Surface" into pi-dev

        if (!shown)

            return false;

        // If we had a preserved surface it's no longer needed, and it may be harmful

        // if we are transparent.

        if (mPendingDestroySurface != null && mDestroyPreservedSurfaceUponRedraw) {

            mPendingDestroySurface.mSurfaceControl.hide();

        }

        return true;

    }