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And threaded access to xsurface FeedActionsHandler

Bug: 1044139
Change-Id: I0857f876776f285728ad938f9f41e92ebea50988
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335478Reviewed-by: Vincent Boisselle <vincb@google.com>
Reviewed-by: Justin DeWitt <dewittj@chromium.org>
Commit-Queue: Dan H <harringtond@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794685}