GitLab

Enable dragging from the main container to the overflow container by opening the
wrench menu when hovering over the button while dragging a browser action. This
also requires keeping the menu open while the drag is happening.

Note: this doesn't fix drag calculations for the overflow menu.
In an effort to keep these patches small, that will come later.

BUG=393038

Review URL: https://codereview.chromium.org/399143004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@285142 0039d316-1c4b-4281-b951-d872f2087c98