Bug 949813 - Remove mIsGlobalSharedContext from GLContext - r=jgilbert
Bug 945586 - Move GLReadTexImageHelper out of GLContext - r=jgilbert
Bug 945586 - Fix a few things in GLReadTexImageHelper - r=jgilbert
Bug 949814 - Remove GetEGLContext and GetLibraryEGL from GLContext - r=jgilbert
Bug 949816 - Move override-EGLSurface feature out of GLContext - r=jgilbert
Bug 949819 - Move remaining ReadPixels and GetTexImage helpers out of GLContext - r=jgilbert