Bookmark sync promo for Views.
Adds a bookmark sync promo at the bottom of the bookmark bubble. The promo is only shown to users that are not signed in. Clicking the link in the sync promo opens the sign in page.
Screenshot with layout_constants: http://i.imgur.com/aYG2y2n.png
(old screenshot: http://i.imgur.com/IqBNGXK.png)
Design document: https://docs.google.com/a/google.com/document/d/1Jduor831szvkdq3cwlWrFw91a8Pzu1ynAs5hlGc7MvM/edit?usp=sharing
TEST=
1. Open Chromium with the --enable-bookmark-sync-promo flag.
2. Make sure you are not signed in.
3. Open the bookmark bubble (click on the bookmark star or Ctrl+D).
Expected result: a sync promo is displayed at the bottom of the bookmark bubble.
4. Click the "Sign in" link in the sync promo.
Expected result: the sign in page is loaded.
BUG=244279
Review URL: https://chromiumcodereview.appspot.com/
18603006
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@212724 0039d316-1c4b-4281-b951-d872f2087c98