Add support for GL_COMMANDS_ISSUED_CHROMIUM fence like query.

Add support for GL_COMMANDS_ISSUED_CHROMIUM fence like query.

I'm not sure this is the right way to do this. I started by adding
a few switch/case statements and then realized that there is
no guarntee that glGenQueriesXXX exists which means I have to NOT
call that for GL_COMMANDS_ISSUED_CHROMIUM queries. I ended up
going down the path of a base class and this is where it lead.

TEST=unit tests
BUG=117768
Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=126607

[greggman, 2012-03-13 01:49:43]

Hey Al, PTAL

[apatrick_chromium, 2012-03-13 19:24:15]

lgtm

http://codereview.chromium.org/9694025/diff/1/gpu/command_buffer/service/quer...
File gpu/command_buffer/service/query_manager.h (right):

http://codereview.chromium.org/9694025/diff/1/gpu/command_buffer/service/quer...
gpu/command_buffer/service/query_manager.h:31: explicit Query(QueryManager*
manager, GLenum target,
explicit is redundant

[nduca, 2012-03-13 19:55:54]

http://codereview.chromium.org/9694025/diff/1/gpu/command_buffer/service/feat...
File gpu/command_buffer/service/feature_info.cc (right):

http://codereview.chromium.org/9694025/diff/1/gpu/command_buffer/service/feat...
gpu/command_buffer/service/feature_info.cc:121:
AddExtensionString("GL_CHROMIUM_fence");
can we call this something liek GL_CHROMIUM_command_buffer_whatever to match the
occlusion query enum?

[greggman, 2012-03-13 20:05:57]

Anything is good for me.

Theoretically though we could have more info

How about GL_CHROMIUM_command_buffer_query?

And then as enums

GL_QUERY_COMMANDS_ISSUED_CHROMIUM  // prolly pointless
GL_QUERY_ELAPSED_TIME_SERVICE_CHROMIUM  // time begin/end gpu-process
GL_QUERY_ELAPSED_ROUND_TRIP_CHROMIUM    // time begin(renderer)/end(gpu-process)

As things you can pass to glGetQueryObjectuiv

[nduca, 2012-03-13 20:07:31]

Thats hot

[commit-bot: I haz the power, 2012-03-14 04:36:50]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/gman@chromium.org/9694025/8001

[commit-bot: I haz the power, 2012-03-14 07:27:37]

Change committed as 126607