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Whether or not CHROMIUM_texture_storage_image is supported depends
entirely on the underlying ImageFactory.

Add a function to query if the ImageFactory has the capability to create
anonymous images, and use this to enable relevant parts of FeatureInfo.
Remove the ifdef that was being used to determine whether or not to
enable CHROMIUM_texture_storage_image, because that was just attempting
to match the capabilities of the ImageFactory (and sometimes failing).

I screwed this up in the previous patch because I was checking for
gpu_memory_manager, thinking that it was gpu_memory_buffer_manager.
As it happens CHROMIUM_gpu_memory_manager is unused, so just remove
it.

Bug: 845213, 849478
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;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I9d97749863c61954151e9f06dc23949613c2181f
Reviewed-on: https://chromium-review.googlesource.com/1088313Reviewed-by: ccameron <ccameron@chromium.org>
Reviewed-by: Sunny Sachanandani <sunnyps@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565140}