Mac: Fix resizing of composited background tabs.
Mac: Fix resizing of composited background tabs.

BUG=54842
TEST=Have an composited tab be a background tab. Resize window larger. Switch to composited tab. It should have the new size.

Review URL: http://codereview.chromium.org/3528019

git-svn-id: http://src.chromium.org/svn/trunk/src@62026 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: f007df3d6f5d6165ee9e030d40f78ad9d9c04938
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser