Define push_messaging module with PushManager skeleton.

Source/modules/push_messaging/PushManager.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/push_messaging/PushManager.h"
+
+#include "RuntimeEnabledFeatures.h"
+#include "bindings/v8/ScriptPromise.h"
+#include "bindings/v8/ScriptPromiseResolver.h"
+#include "core/dom/Document.h"
+#include "core/dom/ExecutionContext.h"
+
+namespace WebCore {
+
+PushManager::PushManager()
+{
+    ScriptWrappable::init(this);
+}
+
+PushManager::~PushManager()
+{
+}
+
+ScriptPromise PushManager::registerPushMessaging(ExecutionContext* context, const String& senderId)
+{
+    ASSERT(RuntimeEnabledFeatures::pushMessagingEnabled());

[abarth-chromium, 2014/03/27 03:38:57]

We usually skip these and trust the IDL

[Michael van Ouwerkerk, 2014/03/27 19:15:24]

Done.

+    RefPtr<ScriptPromiseResolver> resolver = ScriptPromiseResolver::create(context);
+    ScriptPromise promise = resolver->promise();
+    return promise;

[Peter Beverloo, 2014/03/26 21:35:35]

It looks a bit odd that we create a ScriptPromiseResolver instance and then free
it at the end of the method, but that's because we're not actually doing
anything here yet. Could you add a FIXME saying that the actual functionality
still has to be implemented?

[abarth-chromium, 2014/03/27 03:38:57]

Maybe we should reject the promise for now?

[Michael van Ouwerkerk, 2014/03/27 19:15:24]

Done.

[Michael van Ouwerkerk, 2014/03/27 19:15:24]

Done.

+}
+
+} // namespace WebCore