Add back repaint-related tests from fast/canvas.
Add back repaint-related tests from fast/canvas.

BUG=8630
TBR=levin
TEST=none


git-svn-id: http://src.chromium.org/svn/trunk/src@24638 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 366a2f9f415e9f600325ce95960550fbd4fa5a19
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