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Summary of changes:
 - Move the clear activities button under the history/stream tabs
 - Add extension name and icon to activity log page
 - Add headings above activity log items

Refactoring of styles may be done in a follow up CL

Screenshots included in:
https://bugs.chromium.org/p/chromium/issues/detail?id=932768#c5

Bug: 932768
Change-Id: I249cee13e1b5c7e4bd319b5b788a0c05718ba8da
Reviewed-on: https://chromium-review.googlesource.com/c/1483738Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636668}