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This patch consolidates a few discardable image related work into fewer
classes in cc. Specifically, it moves all of the generation code into
discardable image map. It also removes display item list functionality
and just exposes discardable image map from there, since most of those
functions were pass-through.

R=enne@chromium.org, khushalsagar@chromium.org

Bug: 741775
Change-Id: I483d4544f35356465c09f9084d9a0ec3ae0a9029
Reviewed-on: https://chromium-review.googlesource.com/575347
Commit-Queue: Vladimir Levin <vmpstr@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Reviewed-by: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487546}