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This is only half of the bug fix. We also should match windows in that a drag held over a folder for more than a second or so shows the folder's contents and allows the user to continue the drag into the folder.

Also, it's kind of hard to use this new feature since the bookmark items float around when you are dragging out of the same bookmark bar you're dragging into, but the fix for that would be separate (and would require some design decisions).

BUG=14222
TEST=drag single or multiple bookmarks onto a bookmark bar folder

Review URL: http://codereview.chromium.org/149307

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@20186 0039d316-1c4b-4281-b951-d872f2087c98