Add a command to lose the context

Add a command to lose the context

BUG=166020
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=173441

[greggman, 2012-12-14 05:32:50]

As the comment in gles2_cmd_decoder.cc says this probably needs to do either

1) lose the contexts all in the same ContextGroup

or 

2) Crash/Exit the GPU process

or the option for 1 or 2

Thoughts?

[jamesr, 2012-12-14 18:02:41]

(1) would be more useful for the compositor.

[apatrick_chromium, 2012-12-14 19:27:03]

LGTM. I think it might be useful to be able to specify the nature of the lost
context. Maybe an argument to specify crash / guilty / innocent.

[Ken Russell (switch to Gerrit), 2012-12-15 01:21:28]

Thanks for implementing this. A couple of thoughts.

https://codereview.chromium.org/11568029/diff/1/gpu/command_buffer/service/gl...
File gpu/command_buffer/service/gles2_cmd_decoder.cc (right):

https://codereview.chromium.org/11568029/diff/1/gpu/command_buffer/service/gl...
gpu/command_buffer/service/gles2_cmd_decoder.cc:3351: // the current
ContextGroup otherwise you'll likely leak resources.
Yes -- I think the command should lose all contexts in the context group. This
is the way GL_ARB_robustness and GL_EXT_robustness are specified to work, and
this command should probably emulate their behavior as closely as possible.

Also, could the command take two enums? It would be useful to be able to send
down current_context_reset_code and other_contexts_reset_code, each one of the
GL_ARB_robustness guilty/innocent/unknown statuses. It would be useful to test
"guilty" for the current context and "innocent" for all the others
(ARB_robustness' behavior on Linux), as well as "unknown" for all contexts
(ANGLE's EXT_robustness behavior on Windows).

[commit-bot: I haz the power, 2012-12-17 06:50:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gman@chromium.org/11568029/19003

[commit-bot: I haz the power, 2012-12-17 07:21:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gman@chromium.org/11568029/24004

[commit-bot: I haz the power, 2012-12-17 10:19:11]

Change committed as 173441