Use Promises for screen.lockOrientation().

Source/modules/screen_orientation/LockOrientationCallback.cpp

+// 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 "modules/screen_orientation/LockOrientationCallback.h"
+
+#include "bindings/v8/ScriptPromiseResolverWithContext.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/ExceptionCode.h"
+#include "modules/screen_orientation/ScreenOrientation.h"
+
+namespace WebCore {
+
+LockOrientationCallback::LockOrientationCallback(PassRefPtr<ScriptPromiseResolverWithContext> resolver)
+    : m_resolver(resolver)
+{
+}
+
+LockOrientationCallback::~LockOrientationCallback()
+{
+}
+
+void LockOrientationCallback::onSuccess(unsigned angle, blink::WebScreenOrientationType type)
+{
+    // FIXME: for the moment, we do nothing with the angle, we should use it and
+    // convert it to the appropriate type if the type == 'undefined' when the
+    // method will be implemented in ScreenOrientationController.
+    m_resolver->resolve(ScreenOrientation::orientationTypeToString(type));
+}
+
+void LockOrientationCallback::onError(ErrorType error)
+{
+    ExceptionCode code = 0;
+    String msg = "";
+
+    switch (error) {
+    case NotAvailable:
+        code = NotSupportedError;
+        msg = "lockOrientation() is not available on this device.";
+        break;
+    case FullScreenRequired:
+        code = SecurityError;
+        msg = "The page needs to be fullscreen in order to call lockOrientation().";
+        break;
+    case Canceled:
+        code = AbortError;
+        msg = "A call to lockOrientation() or unlockOrientation() canceled this call.";
+        break;
+    default:

[jochen (gone - plz use gerrit), 2014/05/22 08:34:35]

we usually omit the default branch so the compiler complains if you add a new
enum

[mlamouri (slow - plz ping), 2014/05/22 08:58:56]

Done.

+        ASSERT_NOT_REACHED();
+    }
+
+    m_resolver->reject(DOMException::create(code, msg));
+}
+
+} // namespace WebCore