GitLab

ChromeOS.SystemTray.TimeToClick metrics for UnifiedSystemTray was
recorded in old SystemTray class. Reference from UnifiedSystemTray
to SystemTray will be removed in the future, so this is not preferable.

This CL adds Delegate to TimeToClickRecorder to fix this.

TEST=manual(chrome://histograms)
BUG=834462

Change-Id: I249ae40bb471d833bcc24242ade9efc778e295df
Reviewed-on: https://chromium-review.googlesource.com/1029565
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#556371}