Make glGetQueryObjectuivEXT return true for GL_QUERY_RESULT_AVAILABLE_EXT

Make glGetQueryObjectuivEXT return true for GL_QUERY_RESULT_AVAILABLE_EXT

This is so a client waiting for the result to be available
does not wait forever if the context is lost.

BUG=144731
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=153376

[greggman, 2012-08-24 23:09:19]

I'm not 100% sure this works.

The shared memory version of the state will not have an error code if the GPU
process crashed because by definition the GPU process crashed and didn't get a
chance to write an error code.

[piman, 2012-08-24 23:22:28]

On 2012/08/24 23:09:19, greggman wrote:
> I'm not 100% sure this works.
> 
> The shared memory version of the state will not have an error code if the GPU
> process crashed because by definition the GPU process crashed and didn't get a
> chance to write an error code.

LGTM. If the GPU process dies, the CommandBufferProxy will set its state as
lost, either when it fails to send a message (e.g. if we try to flush), or when
it receives the OnChannelError callback (i.e. if we go back to the message loop
while polling).
The only case where it wouldn't work is if we were continuously polling in a
loop without going back to the message loop, which I'm perfectly ok not to
support.

[commit-bot: I haz the power, 2012-08-24 23:25:24]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gman@chromium.org/10883036/1001

[commit-bot: I haz the power, 2012-08-25 01:51:16]

Change committed as 153376