gpu: Add CHROMIUM_gpu_memory_buffer_image extension.

gpu: Add CHROMIUM_gpu_memory_buffer_image extension.

Add initial implementation of CHROMIUM_gpu_memory_buffer_image. This
extension will replace current usage of CHROMIUM_image and
CHROMIUM_image will later become the more generic extension that
can be used by clients that need more control over GpuMemoryBuffer
instances.

BUG=418553
Committed: https://crrev.com/32115e57190cc45b4914e70797189243f53fffe9
Cr-Commit-Position: refs/heads/master@{#297873}

[reveman, 2014-09-30 03:47:26]

reveman@chromium.org changed reviewers:
+ piman@chromium.org

[reveman, 2014-09-30 12:38:58]

https://codereview.chromium.org/617693003/diff/1/gpu/command_buffer/client/gl...
File gpu/command_buffer/client/gles2_implementation.cc (right):

https://codereview.chromium.org/617693003/diff/1/gpu/command_buffer/client/gl...
gpu/command_buffer/client/gles2_implementation.cc:4231: internalformat ==
GL_RGBA ? GL_RGBA8_OES : GL_RGB8_OES,
Note that internalformat will instead be passed through to the GpuControl
implementation in follow up patch that make CreateImage take a ClientBuffer
instead.

[piman, 2014-10-02 17:47:24]

lgtm

[reveman, 2014-10-02 17:48:12]

The CQ bit was checked by reveman@chromium.org

[commit-bot: I haz the power, 2014-10-02 17:48:47]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/617693003/20001

[commit-bot: I haz the power, 2014-10-02 19:01:24]

Committed patchset #2 (id:20001) as 6a9110c1e5c989ef4807cf69db4549bd8b9ea102

[commit-bot: I haz the power, 2014-10-02 19:02:36]

Patchset 2 (id:??) landed as
https://crrev.com/32115e57190cc45b4914e70797189243f53fffe9
Cr-Commit-Position: refs/heads/master@{#297873}