Coordinated Graphics: crash in TiledBackingStore::adjustForContentsRect
https://bugs.webkit.org/show_bug.cgi?id=107639

Patch by Seulgi Kim <seulgikim@company100.net> on 2013-02-04
Reviewed by Kenneth Rohde Christiansen.

In TiledBackingStore::adjustForContentsRect method, inflating is not
needed when there is no intersections between the cover/keep rect and
the content rect.

No new tests, no change in functionality.

* platform/graphics/TiledBackingStore.cpp:
(WebCore::TiledBackingStore::adjustForContentsRect):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@141833 268f45cc-cd09-0410-ab3c-d52691b4dbfc