Make OffscreenCanvas Transferable

third_party/WebKit/Source/bindings/modules/v8/TransferablesForModules.h

Index: third_party/WebKit/Source/bindings/modules/v8/TransferablesForModules.h
diff --git a/third_party/WebKit/Source/bindings/modules/v8/TransferablesForModules.h b/third_party/WebKit/Source/bindings/modules/v8/TransferablesForModules.h
new file mode 100644
index 0000000000000000000000000000000000000000..5fe6f3d6be13cf116c96ab1995bc5b521bd1cd14
--- /dev/null
+++ b/third_party/WebKit/Source/bindings/modules/v8/TransferablesForModules.h
@@ -0,0 +1,31 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef TransferablesForModules_h
+#define TransferablesForModules_h
+
+#include "bindings/core/v8/Transferables.h"
+#include "modules/ModulesExport.h"
+#include "modules/offscreencanvas/OffscreenCanvas.h"
+
+namespace blink {
+
+using OffscreenCanvasArray = HeapVector<Member<OffscreenCanvas>>;
+
+class MODULES_EXPORT TransferablesForModules : public Transferables {
+public:
+    TransferablesForModules() { }
+
+    OffscreenCanvasArray offscreenCanvases;
+
+    DEFINE_INLINE_TRACE()
+    {
+        visitor->trace(offscreenCanvases);
+        Transferables::trace(visitor);
+    }
+};
+
+} // namespace blink
+
+#endif // TransferablesForModules_h