Fix for the flashing of the front tab. - The background tabs think they are visible causing paints to   be executed. These steal the backing store from the visible tab
Fix for the flashing of the front tab.
- The background tabs think they are visible causing paints to
  be executed. These steal the backing store from the visible tab

Please read the bug for more info.

BUG=20831
TEST= see bug for steps


Review URL: http://codereview.chromium.org/199010

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@25739 0039d316-1c4b-4281-b951-d872f2087c98

yitian134/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,ropik/chromium,ropik/chromium,adobe/chromium,adobe/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,gavinp/chromium,adobe/chromium,yitian134/chromium,adobe/chromium,yitian134/chromium,gavinp/chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,Crystalnix/house-of-life-chromium,adobe/chromium,gavinp/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,yitian134/chromium,gavinp/chromium,gavinp/chromium,ropik/chromium,ropik/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,ropik/chromium,yitian134/chromium,adobe/chromium,Crystalnix/house-of-life-chromium,gavinp/chromium,adobe/chromium,gavinp/chromium,adobe/chromium,ropik/chromium,adobe/chromium,yitian134/chromium,Crystalnix/house-of-life-chromium,adobe/chromium,Crystalnix/house-of-life-chromium,ropik/chromium,adobe/chromium