GitLab

- Animate the normal menu items down into the menu while fading in.
- Animate the icon row to the left while fading in.

BUG=394898
NOTRY=true

Review URL: https://codereview.chromium.org/388803006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284781 0039d316-1c4b-4281-b951-d872f2087c98