Revert "Remove NOTIFICATION_WEB_CONTENTS_VISIBILITY_CHANGED from download started animations."

This reverts r228039.

BUG=170921,308177

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228955 0039d316-1c4b-4281-b951-d872f2087c98
Update V8 to version 3.22.13.1.

R=jkummerow@chromium.org

Review URL: https://codereview.chromium.org/27227006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@228956 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 228956