[PresentationAPI] Added plumbing for start/joinSession from JS to platform

Source/modules/presentation/PresentationSessionClientCallbacks.cpp

Index: Source/modules/presentation/PresentationSessionClientCallbacks.cpp
diff --git a/Source/modules/presentation/PresentationSessionClientCallbacks.cpp b/Source/modules/presentation/PresentationSessionClientCallbacks.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..10033511af7fd644826875b4e18c519f6635feb6
--- /dev/null
+++ b/Source/modules/presentation/PresentationSessionClientCallbacks.cpp
@@ -0,0 +1,56 @@
+// 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/PresentationSessionClientCallbacks.h"
+
+#include "bindings/core/v8/ScriptPromiseResolver.h"
+#include "core/dom/DOMException.h"
+#include "core/dom/ExceptionCode.h"
+#include "modules/presentation/Presentation.h"
+#include "modules/presentation/PresentationError.h"
+#include "modules/presentation/PresentationSession.h"
+#include "public/platform/WebString.h"
+#include "public/platform/modules/presentation/WebPresentationError.h"
+#include "wtf/OwnPtr.h"
+
+namespace blink {
+
+PresentationSessionClientCallbacks::PresentationSessionClientCallbacks(
+    PassRefPtrWillBeRawPtr<ScriptPromiseResolver> resolver,
+    Presentation* presentation)
+    : m_resolver(resolver)
+    , m_presentation(presentation)
+{
+    ASSERT(m_resolver);
+    ASSERT(m_presentation);
+}
+
+PresentationSessionClientCallbacks::~PresentationSessionClientCallbacks()
+{
+}
+
+void PresentationSessionClientCallbacks::onSuccess(WebPresentationSessionClient* client)
+{
+    ASSERT(client);
+    if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) {
+        PresentationSession::dispose(client);
+        return;
+    }
+
+    m_resolver->resolve(PresentationSession::take(client, m_presentation));
+}
+
+void PresentationSessionClientCallbacks::onError(WebPresentationError* error)
+{
+    ASSERT(error);
+    if (!m_resolver->executionContext() || m_resolver->executionContext()->activeDOMObjectsAreStopped()) {
+        PresentationError::dispose(error);
+        return;
+    }
+
+    m_resolver->reject(PresentationError::take(error));
+}
+
+} // namespace blink