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RGB texture backed by native GMB cannot be bound to FBO on Intel, but BGR
texture backed by native GMB can be bound.

When GL_EXT_texture_format_BGRA8888 is supported, as-is chromium doesn't allow
BGRA and glTexStorage2D together, because the extensions doesn't define BGRA8
storage format.

Now native GBM needs BGR for WebGL hardware overlay, so this CL allows
both of them for WebGL context.

It's safe because WebGL API doesn't expose BGRA, and DrawingBuffer never use
glTexStorage2D(BGRA8).

BUG=746069
TEST=run WebGL Aquarium on eve
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel;master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I0e74f738beff16826dcc7af5684791712923851c
Reviewed-on: https://chromium-review.googlesource.com/576967
Commit-Queue: Dongseong Hwang <dongseong.hwang@intel.com>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Dongseong Hwang <dongseong.hwang@intel.com>
Cr-Commit-Position: refs/heads/master@{#488461}