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This patch ensures the scrolling contents layer is repainted when
the background color is changed with the inspector protocol.

Bug: 781428
Change-Id: Ia7ba3e7acdf55bf557e42cd9fab62d08f2ce3a0c
Cq-Include-Trybots: master.tryserver.chromium.linux:linux_layout_tests_root_layer_scrolls
Reviewed-on: https://chromium-review.googlesource.com/805006
Commit-Queue: Philip Rogers <pdr@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521996}