Add drawGlFunctor support to RenderThread

 Add gl functor to the prototype support to allow
 webview team to begin playing with RT

 Also create RemoteGLRenderer to avoid needing to make
 breaking changes to GLRenderer. Currently the differences
 are mainly around mFunctorsRunnable and how it queues itself up

Change-Id: I1ca39056189b68cd7b8dded4dd5889d331f6660a