Add Tracing.getCategories to devtools_tracing_handler.cc.

Add Tracing.getCategories to devtools_tracing_handler.cc.

BUG=

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=279161

[chrishenry, 2014-06-17 18:26:49]

Please hold off on reviewing this. I tested using a wrong build.

[chrishenry, 2014-06-17 21:05:58]

Actually this works just fine. The problem is in tracing JS.

[nduca, 2014-06-18 16:38:15]

lgtm on my part but you'll need pfeldman or another content/browser/devtools
OWNER to give you the proper thumbs up. thank you for pulling this, chris!

[pfeldman, 2014-06-18 17:03:20]

lgtm. please make sure the order of methods in .cc matches the one of .h

[chrishenry, 2014-06-18 17:16:17]

The .h and .cc already doesn't seem to be in sync. Shall I follow up with a
patch to reorder them (I don't want to group that with this change)?

I decided to group related methods together (e.g., OnGetCategories +
OnCategoriesReceived are now next to each other). Hope this is reasonable.

[pfeldman, 2014-06-18 17:21:49]

Not making things worse with this patch is enough. I.e. grouping handlers
together would be great.

[chrishenry, 2014-06-20 21:16:24]

The CQ bit was checked by chrishenry@google.com

[commit-bot: I haz the power, 2014-06-20 21:25:06]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/chrishenry@google.com/339743004/40001

[commit-bot: I haz the power, 2014-06-21 06:59:55]

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

[commit-bot: I haz the power, 2014-06-21 07:58:27]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-06-21 07:58:28]

Try jobs failed on following builders:
  win_gpu_triggered_tests on tryserver.chromium.gpu
(http://build.chromium.org/p/tryserver.chromium.gpu/builders/win_gpu_triggered...)

[chrishenry, 2014-06-23 18:26:29]

The CQ bit was checked by chrishenry@google.com

[commit-bot: I haz the power, 2014-06-23 18:27:51]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/chrishenry@google.com/339743004/40001

[commit-bot: I haz the power, 2014-06-23 19:23:03]

Change committed as 279161