Use Promises for screen.lockOrientation().

Source/web/WebDOMException.cpp

Index: Source/web/WebDOMException.cpp
diff --git a/Source/web/WebDOMException.cpp b/Source/web/WebDOMException.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..20c7497d0638507b1cb87f9ff9046b44ba43f048
--- /dev/null
+++ b/Source/web/WebDOMException.cpp
@@ -0,0 +1,72 @@
+// Copyright 2014 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.
+
+#include "config.h"
+#include "public/platform/WebDOMException.h"
+
+#include "V8DOMException.h"
+#include "bindings/v8/V8Binding.h"
+#include "core/dom/DOMException.h"
+#include "wtf/PassOwnPtr.h"
+
+using namespace WebCore;
+
+namespace blink {
+
+WebDOMException WebDOMException::create(unsigned short code, const WebString& name, const WebString& message)
+{
+    return WebDOMException(DOMException::create(code, name, message));
+}
+
+void WebDOMException::reset()
+{
+    m_private.reset();
+}
+
+void WebDOMException::assign(const WebDOMException& other)
+{
+    m_private = other.m_private;
+}
+
+unsigned short int WebDOMException::code() const
+{
+    if (!m_private.get())
+        return 0;
+    return m_private->code();
+}
+
+WebString WebDOMException::name() const
+{
+    if (!m_private.get())
+        return WebString();
+    return m_private->name();
+}
+
+WebString WebDOMException::message() const
+{
+    if (!m_private.get())
+        return WebString();
+    return m_private->message();
+}
+
+v8::Handle<v8::Value> WebDOMException::toV8Value()
+{
+    if (!m_private.get())
+        return v8::Handle<v8::Value>();
+    return toV8(m_private.get(), v8::Handle<v8::Object>(), v8::Isolate::GetCurrent());
+}
+
+WebDOMException::WebDOMException(const PassRefPtrWillBeRawPtr<WebCore::DOMException>& error)
+    : m_private(error)
+{
+}
+
+WebDOMException& WebDOMException::operator=(const PassRefPtrWillBeRawPtr<WebCore::DOMException>& error)
+{
+    m_private = error;
+    return *this;
+}
+
+} // namespace blink
+