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Instead of having to serialize SkRegion (as clipRegion is the only call
that needs a region), instead add a top level "clip device rect" that
takes two parameters.  This is to support the use case that the
RasterSource canvas setup preamble uses to clear the canvas efficiently.

Bug: 737629
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Icfb41557c716d5c52ef44454b8791e29c36d5bda
Reviewed-on: https://chromium-review.googlesource.com/590950Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Vladimir Levin <vmpstr@chromium.org>
Commit-Queue: enne <enne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491159}