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As a follow-up CL to the hot fix
https://chromium-review.googlesource.com/876528, this newly added unit test
verifies whether canvas restores its matrix clip stack after the image is drawn
from old canvas2d bridge to the new canvas2d bridge.

Bug: 803950
Cq-Include-Trybots: master.tryserver.blink:linux_trusty_blink_rel;master.tryserver.chromium.linux:linux_layout_tests_slimming_paint_v2
Change-Id: I129525cad9835f415ac594351ba720d48c63979d
Reviewed-on: https://chromium-review.googlesource.com/888093
Commit-Queue: Olivia Lai <xlai@chromium.org>
Reviewed-by: Justin Novosad <junov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533058}