Handle rejected promises better for workers.

Source/bindings/core/v8/RejectedPromises.h

Index: Source/bindings/core/v8/RejectedPromises.h
diff --git a/Source/bindings/core/v8/RejectedPromises.h b/Source/bindings/core/v8/RejectedPromises.h
new file mode 100644
index 0000000000000000000000000000000000000000..b5fefb096b7060d834d60f7c0be0bdb83b794988
--- /dev/null
+++ b/Source/bindings/core/v8/RejectedPromises.h
@@ -0,0 +1,42 @@
+// Copyright 2015 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 RejectedPromises_h
+#define RejectedPromises_h
+
+#include "platform/heap/Handle.h"
+
+namespace v8 {
+class PromiseRejectMessage;
+};
+
+namespace blink {
+
+class ScriptCallStack;
+class ScriptState;
+
+class RejectedPromises final : public NoBaseWillBeGarbageCollected<RejectedPromises> {
+    DECLARE_EMPTY_DESTRUCTOR_WILL_BE_REMOVED(RejectedPromises);
+public:
+    static PassOwnPtrWillBeRawPtr<RejectedPromises> create()
+    {
+        return adoptPtrWillBeNoop(new RejectedPromises);
+    }
+
+    RejectedPromises();
+    void dispose();
+    void trace(Visitor*);
+
+    void add(ScriptState*, v8::PromiseRejectMessage, const String& errorMessage, const String& resourceName, int scriptId, int lineNumber, int columnNumber, PassRefPtrWillBeRawPtr<ScriptCallStack>);
+
+    void processQueue();
+
+private:
+    class Message;
+    WillBeHeapDeque<OwnPtrWillBeMember<Message>> m_queue;
+};
+
+} // namespace blink
+
+#endif // RejectedPromises_h