Revert of ui: Move GLImage::BindTexImage fallback from GLImage implementations to GLES2CmdDecoder.

Revert of ui: Move GLImage::BindTexImage fallback from GLImage implementations to GLES2CmdDecoder. (patchset #15 id:280001 of https://codereview.chromium.org/1401423003/ )

Reason for revert:
Causing android gpu bots to fail

Original issue's description:
> ui: Move GLImage::BindTexImage fallback from GLImage implementations to GLES2CmdDecoder.
>
> This allows the GPU service to properly track the memory usage
> image backed textures.
>
> It also reduces the complexity of GLImage implementations
> significantly and makes it easier to support format and
> buffer types that require a copy or conversion of data to
> be used for sampling.
>
> This change also includes a few minor GLImage cleanups such
> as removing gfx:: namespace prefix in places where it's not
> needed and making the CopyTexImage GLImage test not part of
> the core GLImage tests as it's optional to support that
> function.
>
> BUG=526298
> TEST=gl_tests --gtest_filter=GpuMemoryBuffer*, gpu_unittests, gl_unittests --gtest_filter=GLImage*
>
> Committed: https://crrev.com/ac2696e324bda3824952148f831e76a8b80594b3
> Cr-Commit-Position: refs/heads/master@{#354870}

TBR=dcastagna@chromium.org,ericrk@chromium.org,fsamuel@chromium.org,liberato@chromium.org,sievers@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=526298
Committed: https://crrev.com/44429f23f3899d52c9493c114ae9b62e1ddeb7af
Cr-Commit-Position: refs/heads/master@{#354914}

[reveman, 2015-10-19 23:36:34]

Created Revert of ui: Move GLImage::BindTexImage fallback from GLImage
implementations to GLES2CmdDecoder.

[commit-bot: I haz the power, 2015-10-19 23:37:11]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1418483003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1418483003/1

[commit-bot: I haz the power, 2015-10-19 23:38:57]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-10-19 23:40:00]

Patchset 1 (id:??) landed as
https://crrev.com/44429f23f3899d52c9493c114ae9b62e1ddeb7af
Cr-Commit-Position: refs/heads/master@{#354914}