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This patch ensures that we pass PaintImage with all of the proper flags
to PictureImageLayer.

R=khushalsagar@chromium.org, pdr@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2835373003
Cr-Commit-Position: refs/heads/master@{#468196}