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This modifies the viewport rect passed to OnDraw() to exclude the origin
if it's non-zero, since otherwise this adversely affects the compositor
clip rect. The non-zero value of the origin is captured in the adjusted
transform.

Bug: 1007012
Change-Id: I614b8ea3f14219d3dba54ad0a552b3e34145500e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1827639Reviewed-by: James MacLean <wjmaclean@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: James MacLean <wjmaclean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700396}