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For top level client windows, the cursor is stored in
WmNativeWidgetAura. For embed roots, it's stored in ServerWindow.
CompoundEventFilter will retrieve the stored cursor while
handling mouse events by using aura::WindowDelegate::GetCursor.
Depending on the target of the mouse event, the WindowDelegate
will be either WindowDelegateImpl (which retrieves it from
ServerWindow or delegates to the top level's delegate) or
WmNativeWidgetAura (which returns its own copy of the cursor).

To test, hover over input field of KSV via:
1. chrome --keyboard-shortcut-viewer-app  Ctrl+Alt+/
or
2. ash_shell_with_content

Bug: 837705
Change-Id: I247b41937aada5a9b161eb469d8230d06890a63b
Reviewed-on: https://chromium-review.googlesource.com/1068661
Commit-Queue: Evan Stade <estade@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567870}