GitLab

http://crrev.com/192706 broke top controls hiding because this situation
doesn't cause any damage, meaning no renderer frames are sent.  Fix it
by causing full root layer damage whenever one of the inputs to
VisibleViewportSize changes.

NOTRY=true
BUG=229138


Review URL: https://chromiumcodereview.appspot.com/13817003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@193011 0039d316-1c4b-4281-b951-d872f2087c98