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This CL borrows code and layout from chrome://inspect to allow us to have
multiple ways to view internals of the process model. Subsequent CLs
will fill in the actual data on those extra panes.

Bug: 850087
Change-Id: Ia2891804dd61346e86c44c4aca32daf57302aed4
Reviewed-on: https://chromium-review.googlesource.com/c/1255599
Commit-Queue: Nasko Oskov <nasko@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596347}