Fix loss of mouse events when an Aura combobox is open in a modal dialog

Fix loss of mouse events when an Aura combobox is open in a modal dialog.

NativeComboboxViews was not passing itself as a (transient) parent to
MenuRunner::RunMenuAt. All mouse events were sent to the open menu (since it
is set as the capture window), and ModalityEventFilter::PreHandleMouseEvent
dropped them all since they were not directed to a child of the active modal
dialog.


BUG=105155
TEST=none


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=113978

[benrg, 2011-12-10 00:10:54]

ben, this one-line change appears to fix issue 105155, which I asked you about
earlier today. I have a nagging feeling I should add a regression test to this
CL, but that would take a lot more work (for me, at least, since I don't know
how to simulate mousing), and I wonder if the fix shouldn't go in by itself
first.

[Ben Goodger (Google), 2011-12-11 21:54:47]

lgtm

[commit-bot: I haz the power, 2011-12-12 00:29:53]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/benrg@chromium.org/8893019/1

[commit-bot: I haz the power, 2011-12-12 03:04:25]

Change committed as 113978