Handle titlebar text updates properly

Previously the area of the text was not invalidated prior to the title drawing. As such all kind of results were possible.

BUG=152597, 151827
TEST=visual

Review URL: https://codereview.chromium.org/10993087

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@159494 0039d316-1c4b-4281-b951-d872f2087c98
29 files changed