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Add a placeholder page to show an activity log for an extension, hidden behind the
"enable-extension-activity-logging" command line flag, and accessible via
chrome://extensions/?id=<extension_id>. If the flag is disabled and a user
navigates to the page, redirect to the extensions details page.

Bug: 898309
Change-Id: Ib0f50487c323e8c07d6fddcd57df3b8e5477cfc6
Reviewed-on: https://chromium-review.googlesource.com/c/1295296Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Kelvin Jiang <kelvinjiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#603176}