Make OffscreenCanvas Transferable

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

Index: third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-expected.txt
diff --git a/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-expected.txt b/third_party/WebKit/LayoutTests/fast/canvas/OffscreenCanvas-transferable-expected.txt
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+Test OffscreenCanvas transferable.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+PASS offscreenCanvas.width is width
+PASS offscreenCanvas.height is height
+PASS offscreenCanvas.width is 0
+PASS offscreenCanvas.height is 0
+PASS Transfer a neutered offscreenCanvas should throw an exception: DataCloneError: Failed to execute 'postMessage' on 'Worker': An OffscreenCanvas is neutered and could not be cloned.
+PASS newOffscreenCanvas.width is width
+PASS newOffscreenCanvas.height is height
+PASS ctx = newOffscreenCanvas.getContext('2d') did not throw exception.
+PASS ctx is an instance of OffscreenCanvasRenderingContext2D
+PASS Transfer an offscreenCanvas with a context should throw an exception: DataCloneError: Failed to execute 'postMessage' on 'Worker': An OffscreenCanvas with a context could not be cloned.
+PASS successfullyParsed is true
+
+TEST COMPLETE
+