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Add a mojo method to send the NSAccessibilityRemoteUIElement tokens for
the NSView and NSWindow in the viewer (app shim) process to the browser
process, and to return the NSAccessibilityRemoteUIElement for the web
contents (in the browser) the viewer (app shim) process.

Update -[BrowserAccessibilityCocoa window] to call either
-[NSView window] or -[NSAccessibilityRemoteUIElement windowUIElement],
depending on which object is returned by GetParentView.

Change -[RenderWidgetHostViewCocoa accessibilityFocusedUIElement] to
call a GetFocusedBrowserAccessibilityElement, which will return the
the NSAccessibilityRemoteUIElement when called in an app shim
process.

Bug: 900846
Change-Id: I0d3d65e9924613b0dc137a08d0030d31981ecfdd
Reviewed-on: https://chromium-review.googlesource.com/c/1351415
Commit-Queue: ccameron <ccameron@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611284}