Generate the full EGL configs in the Renderers. Specify the default framebuffer formats in GL formats but still use BGRA and ANGLEX formats for now. BUG=angle:658 Change-Id: I7192db4ca76ab4b0b42daa43785a7ddd9528a9ca Reviewed-on: https://chromium-review.googlesource.com/239902 Reviewed-by: Jamie Madill <jmadill@chromium.org> Tested-by: Geoff Lang <geofflang@chromium.org>