GitLab

1. Reset the background of the tooltip frame view or it paints behind the
BubbleBorder2 and makes it look blurry.
2. LauncherTooltip bubbles should not consume mouse hovers.
3. BubbleBorder2::GetBorderThickness should return the actual thickness.

BUG=none
TEST=none


Review URL: https://chromiumcodereview.appspot.com/10828266

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@151161 0039d316-1c4b-4281-b951-d872f2087c98