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We want multiple instances of these pages with different flags e.g.
sw raster and gpu raster in the new rendering.desktop/mobile page sets.

BUG=760553

Change-Id: I48e2ac82a4314cdf36a61f301559160b8d801f52
Reviewed-on: https://chromium-review.googlesource.com/887798
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Ned Nguyen <nednguyen@google.com>
Cr-Commit-Position: refs/heads/master@{#533043}