Making window.focus() work in Chrome

Making window.focus() work in Chrome.
A patch on the WebKit side https://bugs.webkit.org/show_bug.cgi?id=43542
ensures we get the correct notification when window.focus()/blur() is called.
This CL makes the browser active/unactive in response to the focus/blur message.

BUG=29643
TEST=Visit gmail. Open an IM conversation window and pop-it out.
     Focus the browser (so the IM window is in the back). Click on the person name in the IM section of gmail.
     The conversation window should be brought back to the front.
     Repeat but this time minimize the conversation window.


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=55678

[Ben Goodger (Google), 2010-08-09 19:26:05]

LGTM

http://codereview.chromium.org/3060045/diff/15003/53005
File chrome/browser/cocoa/browser_window_cocoa.mm (right):

http://codereview.chromium.org/3060045/diff/15003/53005#newcode112
chrome/browser/cocoa/browser_window_cocoa.mm:112: // TODO(jcivelli):
http://crbug.com/51364 Implement me.
NOTIMPLEMENTED?

http://codereview.chromium.org/3060045/diff/15003/53008
File chrome/browser/gtk/browser_window_gtk.cc (right):

http://codereview.chromium.org/3060045/diff/15003/53008#newcode714
chrome/browser/gtk/browser_window_gtk.cc:714: // TODO(jcivelli):
http://crbug.com/51364 Implement me.
NOTIMPLEMENTED?

http://codereview.chromium.org/3060045/diff/15003/53027
File views/window/window_gtk.cc (right):

http://codereview.chromium.org/3060045/diff/15003/53027#newcode134
views/window/window_gtk.cc:134: // TODO(jcivelli): http://crbug.com/51364
Implement me.
NOTIMPLEMENTED