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Occasionally, 2 activity log entries with the same api call exist in the
database. When presented to the UI, this can confuse some users. This CL
groups activities by their api call and sorts them based on the total
number of calls. This achieves feature parity with the Chrome Apps and
Extensions Developer Tool.

Bug: 832354
Change-Id: I566a3620b6a5fd3b35825e49d3db5fb9fbb7f416
Reviewed-on: https://chromium-review.googlesource.com/c/1350924
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#613311}