Improve BindBufferBase/BindBufferRange and a few other commands.

Improve BindBufferBase/BindBufferRange and a few other commands.

1) The original plan was to push out a quick WebGL 2 prototype, so Nacl
   code path is not considered, i.e., we didn't consider the case that we
   could bind to a buffer ID that hasn't been created through GenBuffers.
   This CL addresses this gap.
2) This CL fixed a bug that on the service side, when we receive an invalid
   client ID, we need to generate an GL error instead of passing down to call
   underlying APIs.

BUG=429053
TEST=gpu_unittests
R=piman@chromium.org

Committed: https://crrev.com/ee3fa9866a01dc2fcd1e3beb188c683ba4d79e8b
Cr-Commit-Position: refs/heads/master@{#311137}

[Zhenyao Mo, 2015-01-12 20:54:44]

Patchset #1 (id:1) has been deleted

[Zhenyao Mo, 2015-01-12 20:57:48]

piman: this addresses several comments you made in previous CLs.  Please take a
look.

Others: FYI.

[piman, 2015-01-12 22:11:33]

LGTM, thanks!

[Zhenyao Mo, 2015-01-12 22:25:32]

The CQ bit was checked by zmo@chromium.org

[commit-bot: I haz the power, 2015-01-12 22:26:37]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/846943002/40001

[commit-bot: I haz the power, 2015-01-12 23:07:18]

Committed patchset #2 (id:40001)

[commit-bot: I haz the power, 2015-01-12 23:08:00]

Patchset 2 (id:??) landed as
https://crrev.com/ee3fa9866a01dc2fcd1e3beb188c683ba4d79e8b
Cr-Commit-Position: refs/heads/master@{#311137}