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If a method is handled by a custom hook, we won't notify the browser
(where we normally would with an API request), and so the activity log
won't be updated. Add support for activity logging with native binding.

If a request is handled by a custom hook and a request is not sent to
the browser, notify the activity logger (which will send the information
along to the browser process).  This matches the logic we currently have
in the JS bindings.

Add unit tests for the same.  In addition to the unit tests, this fixes
ActivityLogApiTest.TriggerEvent with native bindings enabled.

BUG=653596

Review-Url: https://codereview.chromium.org/2962093002
Cr-Commit-Position: refs/heads/master@{#485457}