In D3D11 with DXGI1.2, use B5G6R5 for GL_RGB565 *re-land with build fix* BUG=angleproject:1002 Change-Id: Ic1d8ea23dc1bf56e713e5d991ab9edd48978d3d7 Reviewed-on: https://chromium-review.googlesource.com/272515 Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>