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Show recent extension activities by making a call to
chrome.activityLogPrivate.getExtensionActivities whenever the user
navigates to the activity log page. Currently, the activity type,
api call, event count and page url (if there is one) are shown
in descending order of event count.

Note: the activity log database can sometimes store more than one entry
that has the same api call/event type. This CL currently does not
group any duplicate activity entries.

Bug: 832354
Change-Id: I0191d77cd7961bdc5d95ec8daea98d39b1a7c638
Reviewed-on: https://chromium-review.googlesource.com/c/1321166
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607924}