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This CL wraps the MD extensions pages (details view, error
page, and shortcuts page) in cr-lazy-render to accelerate the initial page load.
The item list is not lazily rendered because it's the main page.

Bug: 770392
Cq-Include-Trybots: master.tryserver.chromium.linux:closure_compilation
Change-Id: I5cc1d58f42c7bf56463d222a9a2dda7e0aa494ce
Reviewed-on: https://chromium-review.googlesource.com/731884
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#512725}