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This CL is a followup on the following CL:
https://chromium-review.googlesource.com/736043

The above CL returns the deepest child of web view on ACTION_PREVIOUS_HTML_ELEMENT if
can_wrap_to_last_element flag in OneShotAccessibilityTreeSearch is set to true.
This CL sets that flag for Android. Assuming a web view is in between native elements, the
following order will be followed for a11y focus:
Native elements -> web view container -> inside web view container -> native elements.
So web view container will always be focused only in the above order.

Bug: 661793
Change-Id: I62dbcb143ed5a152172dc7cde9355f4b7eed79e1
Reviewed-on: https://chromium-review.googlesource.com/884302Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#536742}