Instrumenting WindowImpl::WndProc to find jank

Instrumenting WindowImpl::WndProc to find jank
Prior instrumentations didn't catch the jank, i.e. most jank is inside "440919 <<MessagePumpForUI::ProcessNextWindowsMessage>>", but outside of other instrumentations.
This means that the places I suspected are sources of jank actually aren't.

Widening the search.

BUG=440919
Committed: https://crrev.com/fa84141823aeaad1c993d6eb24975df6fdc8017f
Cr-Commit-Position: refs/heads/master@{#309457}

[vadimt, 2014-12-19 22:34:07]

vadimt@chromium.org changed reviewers:
+ cpu@chromium.org

[vadimt, 2014-12-19 22:34:08]

cpu@, please review

[cpu_(ooo_6.6-7.5), 2014-12-20 00:51:07]

https://codereview.chromium.org/816113003/diff/1/ui/gfx/win/window_impl.cc
File ui/gfx/win/window_impl.cc (right):

https://codereview.chromium.org/816113003/diff/1/ui/gfx/win/window_impl.cc#ne...
ui/gfx/win/window_impl.cc:288: 
shouldn't be that lines 285-288 moved to 304 ?

[vadimt, 2014-12-20 01:02:14]

https://codereview.chromium.org/816113003/diff/1/ui/gfx/win/window_impl.cc
File ui/gfx/win/window_impl.cc (right):

https://codereview.chromium.org/816113003/diff/1/ui/gfx/win/window_impl.cc#ne...
ui/gfx/win/window_impl.cc:288: 
Done; this is more efficient.

FYI, semantically, there is no difference in what we could catch with these 2
instrumentations, since if I left it as as, the second tracker's time would be
subtracted from the first one, so the first one would catch only janks in the
SECOND part of the method.

[cpu_(ooo_6.6-7.5), 2014-12-22 19:22:57]

lgtm

[vadimt, 2014-12-22 19:23:31]

The CQ bit was checked by vadimt@chromium.org

[commit-bot: I haz the power, 2014-12-22 19:24:07]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/816113003/20001

[commit-bot: I haz the power, 2014-12-22 20:32:25]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2014-12-22 20:33:27]

Patchset 2 (id:??) landed as
https://crrev.com/fa84141823aeaad1c993d6eb24975df6fdc8017f
Cr-Commit-Position: refs/heads/master@{#309457}