MacViews: Synchronize resize operations with the GPU process

MacViews: Synchronize liveResize operations with the GPU process

Currently composited UI frames during a live-resize arrive out of sync,
and get queued up, resulting in wasted work and odd behavior where the
window contents lag behind the window size.

To fix, use ui::WindowResizeHelperMac to watch messages coming in from
the GPU process and block the UI thread until it's ready to display a
composited frame that matches the window.

For now, just fix resize, which hooks in via -[NSWindowDelegate
windowDidResize:]. In future, we may want to block for other cases (E.g.
showing a window-modal sheet should wait before starting the animation.)

BUG=531831
Committed: https://crrev.com/8ffc5c5a955fa1395f6476927b5fdbc59ee8b767
Cr-Commit-Position: refs/heads/master@{#351012}

[tapted, 2015-09-18 06:16:52]

Patchset #4 (id:60001) has been deleted

[tapted, 2015-09-18 06:33:06]

tapted@chromium.org changed reviewers:
+ ccameron@chromium.org

[tapted, 2015-09-18 07:56:58]

Hi Chris, please take a look (assuming that other CL goes through..). I've
trimmed this down a bit so it's just dealing with liveResize. The rationale
being that, in other cases, it's better just to let the UI thread keep running
since the user is unlikely to notice.

I also considered putting `MaybeWaitForFrame` on AcelleratedWidgetMac, but
RenderWidgetHostViewMac has some other things to consider, so it didn't look
like a good fit

Thanks!

[tapted, 2015-09-24 08:52:16]

Hi Chris, now that r350449 has landed, could you take a look when you get a
chance?

[ccameron, 2015-09-25 19:59:00]

This lgtm

[tapted, 2015-09-27 23:51:14]

The CQ bit was checked by tapted@chromium.org

[commit-bot: I haz the power, 2015-09-27 23:51:22]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1352743002/140001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1352743002/140001

[commit-bot: I haz the power, 2015-09-28 00:15:00]

Committed patchset #7 (id:140001)

[commit-bot: I haz the power, 2015-09-28 00:15:51]

Patchset 7 (id:??) landed as
https://crrev.com/8ffc5c5a955fa1395f6476927b5fdbc59ee8b767
Cr-Commit-Position: refs/heads/master@{#351012}