Reland of: Make OffscreenCanvas Transferable

third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-exceptions-expected.txt

Index: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-exceptions-expected.txt
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-exceptions-expected.txt b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-exceptions-expected.txt
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index 0000000000000000000000000000000000000000..cc00da90ee792cbb071c17ea7ea2257779d0a0b2
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+++ b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-exceptions-expected.txt
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+Test OffscreenCanvas transferable with exception cases.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS ctx = offscreenCanvas1.getContext('2d') did not throw exception.
+PASS ctx is an instance of OffscreenCanvasRenderingContext2D
+PASS worker.postMessage({data: offscreenCanvas1}, [offscreenCanvas1]) threw exception DataCloneError: Failed to execute 'postMessage' on 'Worker': An OffscreenCanvas with a context could not be cloned..
+PASS offscreenCanvas2.transferToImageBitmap() threw exception InvalidStateError: Failed to execute 'transferToImageBitmap' on 'OffscreenCanvas': Cannot transfer an ImageBitmap from a detached OffscreenCanvas.
+PASS worker.postMessage({data: offscreenCanvas2}, [offscreenCanvas2]) threw exception DataCloneError: Failed to execute 'postMessage' on 'Worker': An OffscreenCanvas is detached and could not be cloned..
+PASS offscreenCanvas2.getContext('2d') threw exception InvalidStateError: Failed to execute 'getContext' on 'OffscreenCanvas': OffscreenCanvas object is detached.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+