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The tooltip text for UserAvatarButon was set but not visible, because
can_process_event_within_subtree for its child view was true.

TEST=manual
BUG=853710

Change-Id: I081a96628b1ab77e4ca57ef7d5900777a864b297
Reviewed-on: https://chromium-review.googlesource.com/1107432Reviewed-by: Yoshiki Iguchi <yoshiki@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569495}