Merge 76437 - 2011-01-22 Adrienne Walker <firstname.lastname@example.org>
Reviewed by James Robinson.
[chromium] Fix compositor repaints for offscreen fixed elements
The fast path scrolling was clipping offscreen invalidations.
Additionally, the compositor was ignoring all invalidations that were
entirely out of the content rect.
Test: compositing/ to verify this caused no regressions.
Tested fix manually in browser as I could not generate a LayoutTest that reproduced the bug in run-webkit-tests.