In-process SharedImageInterface

This adds a InProcessSharedImageInterface tear-off class linked to
InProcessCommandBuffer, that implements SharedImageInterface using the
same GLContext/GLSurface and TaskExecutor as the InProcessCommandBuffer.

Bug: 870116
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: I916a87a3ae6c1360e1e10766654b96455eb2e1ca
Reviewed-on: https://chromium-review.googlesource.com/1171782
Commit-Queue: Antoine Labour <piman@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582441}
7 files changed