cc: Add TRACE_EVENTs to SingleThreadProxy

cc: Add TRACE_EVENTs to SingleThreadProxy

This adds traces to entry points in SingleThreadProxy that have
analogous trace events in the ThreadProxy. Also add trace points
along the critical CompositeImmediately -> CommitAndComposite ->
DoCommit/DoComposite code path.

R=enne
BUG=339248
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=247874

[enne (OOO), 2014-01-30 00:03:18]

lgtm

https://codereview.chromium.org/149053006/diff/1/cc/trees/single_thread_proxy.cc
File cc/trees/single_thread_proxy.cc (right):

https://codereview.chromium.org/149053006/diff/1/cc/trees/single_thread_proxy...
cc/trees/single_thread_proxy.cc:86: TRACE_EVENT0("cc",
"SingleThreadProxy::FinishAllRendering");
nit: put this trace before the DCHECK for consistency, here and elsewhere

[danakj, 2014-01-30 00:06:24]

https://codereview.chromium.org/149053006/diff/1/cc/trees/single_thread_proxy.cc
File cc/trees/single_thread_proxy.cc (right):

https://codereview.chromium.org/149053006/diff/1/cc/trees/single_thread_proxy...
cc/trees/single_thread_proxy.cc:86: TRACE_EVENT0("cc",
"SingleThreadProxy::FinishAllRendering");
On 2014/01/30 00:03:18, enne wrote:
> nit: put this trace before the DCHECK for consistency, here and elsewhere

Oh I did it after for consistency with what I saw in ThreadProxy. Lulz. At the
top sounds good tho, we can do that there too.

[commit-bot: I haz the power, 2014-01-30 00:12:29]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/danakj@chromium.org/149053006/20001

[commit-bot: I haz the power, 2014-01-30 03:04:31]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-30 03:12:45]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/danakj@chromium.org/149053006/20001

[commit-bot: I haz the power, 2014-01-30 07:33:33]

Change committed as 247874