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When a <select size=1> receives focus, a focus event should be fired on
the combobox/menupopupbutton object.

When the value changes in a collapsed state, only the value change event
should be fired, but not a focus or activedescendantchanged event.

When the value changes in an expanded state, then the focus and/or
activedescendantchanged events can be fired.

This fixes some strange behavior with NVDA when Alt+Down is used to open
the select.

Bug: 621510
Change-Id: I30fd744157ecbb5180d5c77f2713a73fa168397a
Reviewed-on: https://chromium-review.googlesource.com/1175034
Commit-Queue: Aaron Leventhal <aleventhal@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583367}