Presentation API: implement .getAvalability() (Blink side).

Source/modules/presentation/PresentationAvailabilityCallback.cpp

+// 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.
+
+#include "config.h"
+#include "modules/presentation/PresentationAvailabilityCallback.h"
+
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "modules/presentation/PresentationAvailability.h"
+
+namespace blink {
+
+PresentationAvailabilityCallback::PresentationAvailabilityCallback(PassRefPtr<ScriptPromiseResolver> resolver)
+    : m_resolver(resolver)
+{
+    ASSERT(m_resolver);
+}
+
+void PresentationAvailabilityCallback::onSuccess(bool* result)
+{
+    OwnPtr<bool> availability = adoptPtr(result);
+    if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped())
+        return;
+    m_resolver->resolve(PresentationAvailability::take(m_resolver.get(), *availability));
+}
+
+void PresentationAvailabilityCallback::onError()
+{
+    if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped())
+        return;
+    m_resolver->reject();
+}
+
+} // namespace blink