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When the page zooms, for example, to 200%, the offset of the shadow
remains the same as when the page scale is 100%. The problem here is
that whenever we zoom the page, we queue a paint call back. Then the
new paint call back will set the shadow offset with the size that doesn't
account for the page zoom.

The fix is to override the BaseRenderingContext2d::setShadowOffset
method with the zoom.

This CL also includes a layout test to verify the correctness of the fix.

Bug: 849706
Change-Id: I427209fca397a7540936bccd9e8fb18ba7c018ba
Reviewed-on: https://chromium-review.googlesource.com/1087874Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Fernando Serboncini <fserb@chromium.org>
Commit-Queue: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#564955}