This CL fixes issue 17468 - Regression: Extra white rectangle showing when mouse hovering on every web page
This CL fixes issue 17468 - Regression: Extra white rectangle showing when mouse hovering on every web page

Should check tooltip text against empty before adding Unicode Marks for directionality.

BUG=http://crbug.com/17468
BUG=http://crbug.com/17176
BUG=http://crbug.com/5996
TEST= open a webpage, mouse over plain text area, empty square should not show up as tooltip. 
Review URL: http://codereview.chromium.org/159222

git-svn-id: http://src.chromium.org/svn/trunk/src@21353 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 49538c755c7bf884f09bae8615278dd99f730dff
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