Revert "Revert "add rect-parameter to makeImageSnapshot""

This reverts commit 1e28e5d79e895e502afddecda2eb66a73a453d38.

Bug: skia:
Change-Id: I71c246885721c71de540e9079ecf7323234c8871
Reviewed-on: https://skia-review.googlesource.com/c/172302
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Mike Reed <reed@google.com>
9 files changed