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If GL image textures are supported, and we can find the image texture
target for the desired format, then use TexStorage2DImageCHROMIUM to
allocate the texture so that it may be used for scanout.

From the original patch this fixes layout tests which were trying to
use overlays but can't. Now this asks the RenderThreadImpl if Gpu
memory buffers should be used at all before trying to use the map
to determine targets.

Also noticed that we are not resetting the composited_output_modified_
bool for damage in the gpu texture upload path, which means we'll
submit more frames than we used to without purpose. So resetting that
bool to false now on the gpu compositing path.

R=ccameron
TBR=piman@chromium.org

Bug: 786140
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: I1ad318f45143f8587f5f99775afbe23a0a9eafc4
Reviewed-on: https://chromium-review.googlesource.com/783851
Commit-Queue: danakj <danakj@chromium.org>
Reviewed-by: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#518809}