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This adds support for parsing APNG images by hooking into the
data_decoder service. webkit::WebImage API is extended to support
fetching the relevant animation data from blink's PNG decoder.

Bug: 750064, 719015
Change-Id: I7fb38643dce5d6e16eaaee2b6f74253ba70af20a
Reviewed-on: https://chromium-review.googlesource.com/679459
Commit-Queue: Jacob Dufault <jdufault@chromium.org>
Reviewed-by: Ken Rockot <rockot@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#506768}