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This will allow for IME/omnibox coordination, as the omnibox can observe when
the candidate window is open.

Currently, there is no distinction between the suggest window and candidate
window in these events, but it can be changed later.

BUG=chromium-os:17763
TEST=


Review URL: http://codereview.chromium.org/8840002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113572 0039d316-1c4b-4281-b951-d872f2087c98