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This CL will parse the rich entity image dominant color and the image
URL. The data is not yet used on the client, that will happen in a later
CL. (Similar to the prior CLs which moved the values from the
CompleteServer to GWS; then from GWS to Chrome; now this moves the values
from the received JSON data to closer to the GUI code).

TBR=mpearson@chromium.org

Bug: 798631
Change-Id: I1d4a31e4b149669c058340ad856ebf89f0663147
Reviewed-on: https://chromium-review.googlesource.com/994129Reviewed-by: Dave Schuyler <dschuyler@chromium.org>
Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Dave Schuyler <dschuyler@chromium.org>
Cr-Commit-Position: refs/heads/master@{#550500}