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This CL defers the subframe transform until serializing so as to not
affect the position of the sub-picture in the paint preview if
embedding into a single SkPicture.

Change-Id: I613e713e08ea453dd7999f06810f7481501b0658
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2364171Reviewed-by: Mehran Mahmoudi <mahmoudi@chromium.org>
Commit-Queue: Calder Kitagawa <ckitagawa@chromium.org>
Cr-Commit-Position: refs/heads/master@{#801007}