GLSurfaceView will now automatically use the Choreographer to
schedule render updates on VSYNC. This happens only in
RENDERMODE_CONTINUOUSLY.
GLSurfaceView was rewriten to use a Looper and a HandlerThread
instead of a custom thread.
The basic mode of operation is unchanged, however the implementation
is largely different.
Removed support for older GPUs which had a limited number of contexts.
Bug: 8485730
Change-Id: I7b270f7ad7bb1259e858429054b1c8c9cc159dc6
57d019e222