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Currently, we only process 1 draw op when checking if a layer is solid
color, despite DisplayItemList::ShouldBeAnalyzedForSolidColor having
a cutoff of 10.

This change updates GetColorIfSolidInRect to take the number of ops to
analyze, and causes RecordingSource::DetermineIfSolidColor to use a
value of 10 for full-layer checks.

R=vmpstr
Bug:741219

Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Id4b2a72994835d096ed0f4aad24deb663e90d459
Reviewed-on: https://chromium-review.googlesource.com/567554
Commit-Queue: Eric Karl <ericrk@chromium.org>
Reviewed-by: Vladimir Levin <vmpstr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486567}