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Add a new CAMERA_READ_WRITE gfx::BufferUsage, which is used to specify
buffer usage capable of CPU read/write and camera read/write.

The R_8 format is used by the Chrome OS camera HAL as the underlying
format for the generic blob format.  Blob format is usually used to
store the picture taken by the camera in JPEG format.

BUG=832772

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: Ibd8d4e193ced3c7d2a6284a8576f02a40ede74b3
Reviewed-on: https://chromium-review.googlesource.com/1018922
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Reviewed-by: Antoine Labour <piman@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Daniele Castagna <dcastagna@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#554378}