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This CL adds metrics for the action taken by the user through the extension icon
context menu.

BUG=885201

Change-Id: I5eb2261f493298667ec978d24e554b15814e5f84
Reviewed-on: https://chromium-review.googlesource.com/1239217
Commit-Queue: Karan Bhatia <karandeepb@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#593782}