Instrumenting more of WM_ message processing for jank

Instrumenting more of WM_ message processing for jank
This covers some Omnibox stuff, which is probably responsible for the jank in keyboard messages processing and drilling down some of issues.
There are some issues that require advanced investigations that are not included in this CL:
1. PeekMessage, which is probably processing hooks
2. DispatchMessage, maybe, having same issues
3. GetQueueStatus (!!!)
4. DefWndProc

BUG=440919
Committed: https://crrev.com/2e7c444831ca184786cd5ceaf06875f3a2672f44
Cr-Commit-Position: refs/heads/master@{#313529}

[vadimt, 2015-01-28 01:55:19]

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

[vadimt, 2015-01-28 01:55:20]

cpu@, please review

[cpu_(ooo_6.6-7.5), 2015-01-28 02:50:52]

lgtm

the omnibox is going to spawn a renderer to render stuff so I expect it to be
slow, that is the whole point of 1993.

[vadimt, 2015-01-28 15:23:40]

The CQ bit was checked by vadimt@chromium.org

[commit-bot: I haz the power, 2015-01-28 15:24:17]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/879153002/1

[commit-bot: I haz the power, 2015-01-28 16:58:12]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-01-28 16:58:55]

Patchset 1 (id:??) landed as
https://crrev.com/2e7c444831ca184786cd5ceaf06875f3a2672f44
Cr-Commit-Position: refs/heads/master@{#313529}