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This is supported on OSX and was triggered when running with
--enable-oop-rasterization and --enable-raster-decoder. This CL is
necessary before we can land http://crrev.com/c/1031012

Notable changes:

- shuffled some code from compositor_util to gpu_memory_support so that
  we can use it in a lower layer

- add proper gpu memory buffer support to InProcCmdBuffer

- add a raster_in_process_context_tests to give us some basic code
  coverage

- copy-pasta from GLES2DecoderImpl to RasterDecoderImpl to implement
  TexStorage2DImage

Bug: 789238
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: Iee75adbfd922ab0c94f2e563fe4fbdbf4c84f231
Reviewed-on: https://chromium-review.googlesource.com/964894Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Commit-Queue: Jonathan Backer <backer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555825}