For OSX, make it so that notifications only start resizing after the first paint is done.

Also, only allow them to grow.

A later fix will remove this ifdef replacing it with code that works across platforms.

BUG=56693
TEST=Ran many tests manually. Automated test in progress (before closing the bug).

Review URL: http://codereview.chromium.org/5361006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@67673 0039d316-1c4b-4281-b951-d872f2087c98
3 files changed