Committing original patch http://codereview.chromium.org/178036 by Vassili Bykov.
Committing original patch http://codereview.chromium.org/178036
by Vassili Bykov.

BUG=19983
TEST=Follow the steps in the bug to test the bubble's 
     move-out-of-the-way behavior with dowload shelf
     both visible and hidden.

Review URL: http://codereview.chromium.org/200135

git-svn-id: http://src.chromium.org/svn/trunk/src@26250 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 417678c38ea01db573c84671aafaf83efeeea2d8
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