Remove GL query processing from DrawElements/DrawArrays.

Remove GL query processing from DrawElements/DrawArrays.

Polling GL queries is taking ~7us each time on Android.  Processing
queries from ::DrawElements & ::DrawArrays may not be a good idea as
50 to 100 draw calls per-frame with GPU rendering is common
i.e. 350~700us, and more so as we aim for handling higher draw call
counts in the future.

Pending queries are still polled in the following cases:
 - After glFlush().
 - After glFinish().
 - After processing any GpuCommandBufferStub  IPC message.
 - As delayed work, at up to 1000Hz.

BUG=385937
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=278533

[vmiura, 2014-06-19 06:53:20]

ptal

[reveman, 2014-06-19 14:17:35]

lgtm

[piman, 2014-06-19 19:18:01]

lgtm

[no sievers, 2014-06-19 23:00:29]

lgtm

[vmiura, 2014-06-19 23:04:13]

The CQ bit was checked by vmiura@chromium.org

[commit-bot: I haz the power, 2014-06-19 23:06:14]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/vmiura@chromium.org/342923002/1

[commit-bot: I haz the power, 2014-06-19 23:19:13]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_chromium_chromeos_clang_dbg on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/linux_chromium_chrome...)

[commit-bot: I haz the power, 2014-06-19 23:50:16]

Change committed as 278533