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This enables the action mode bar, which has the "Copy", "Select", "Share
all" and "Web search" options when text is selected.

Change-Id: Id91ce30e7f389d9105626f1f463fa687751dfa65
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1900570
Commit-Queue: Clark DuVall <cduvall@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712858}