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R=tmrts@chromium.org, ulan@chromium.org

Label click is a critical user journey for Gmail.

Perform a label click and go to next page of results.

Bug: 1044682
Change-Id: I43b95f720d494451b94c225fc7cc11c7c4b3c0ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036550
Commit-Queue: Benjamin Smith <codesmith@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#782831}