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This will make it possible to call BaseRenderingContext2D.drawImage with CSSOM Style Image object as an argument.

BUG=567358
TEST=third_party/WebKit/LayoutTests/csspaint/paint2d-image.html

Review-Url: https://codereview.chromium.org/2351363002
Cr-Commit-Position: refs/heads/master@{#422010}