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This CL adds a test to make sure that there are no paint entries when a
sibling frame paints an image.

Bug: 736114
Change-Id: Ie65dc1f3aea6d67f690164ba9007950eba7a5c6d
Reviewed-on: https://chromium-review.googlesource.com/769929
Commit-Queue: Nicolás Peña Moreno <npm@chromium.org>
Reviewed-by: Timothy Dresser <tdresser@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519790}