In D3D11 with DXGI1.2, use B5G6R5 for GL_RGB565 BUG=angleproject:1002 Change-Id: I13dfe218fd9dce6581843d7fab33ce482187e351 Reviewed-on: https://chromium-review.googlesource.com/270771 Tested-by: Austin Kinross <aukinros@microsoft.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org>