Adds NetInfo v3 Web API to Blink.

Source/modules/netinfo/NavigatorNetworkInfoConnection.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/netinfo/NavigatorNetworkInfoConnection.h"
+
+#include "core/frame/DOMWindow.h"
+#include "core/frame/LocalFrame.h"
+#include "core/frame/Navigator.h"
+#include "modules/netinfo/NetworkInfoConnection.h"
+
+namespace WebCore {
+
+NavigatorNetworkInfoConnection::NavigatorNetworkInfoConnection(Navigator& navigator)
+    : DOMWindowProperty(navigator.frame())
+{
+}
+
+NavigatorNetworkInfoConnection::~NavigatorNetworkInfoConnection()
+{
+}
+
+NavigatorNetworkInfoConnection& NavigatorNetworkInfoConnection::from(Navigator& navigator)
+{
+    NavigatorNetworkInfoConnection* supplement = toNavigatorNetworkInfoConnection(navigator);
+    if (!supplement) {
+        supplement = new NavigatorNetworkInfoConnection(navigator);
+        provideTo(navigator, supplementName(), adoptPtrWillBeNoop(supplement));
+    }
+    return *supplement;
+}
+
+NavigatorNetworkInfoConnection* NavigatorNetworkInfoConnection::toNavigatorNetworkInfoConnection(Navigator& navigator)
+{
+    return static_cast<NavigatorNetworkInfoConnection*>(WillBeHeapSupplement<Navigator>::from(navigator, supplementName()));
+}
+
+const char* NavigatorNetworkInfoConnection::supplementName()
+{
+    return "NavigatorNetworkInfoConnection";
+}
+
+NetworkInfoConnection* NavigatorNetworkInfoConnection::connection(Navigator& navigator)
+{
+    return NavigatorNetworkInfoConnection::from(navigator).connection();
+}
+
+NetworkInfoConnection* NavigatorNetworkInfoConnection::connection()
+{
+    if (!m_connection && frame()) {
+        ASSERT(frame()->domWindow());
+        m_connection = NetworkInfoConnection::create(frame()->domWindow()->executionContext());
+    }
+    return m_connection.get();
+}
+
+void NavigatorNetworkInfoConnection::trace(Visitor* visitor)
+{
+    visitor->trace(m_connection);

[adamk, 2014/05/27 21:44:27]

I think you also want to trace your WillBeHeapSupplement<Navigator> base class
here (based on looking at, e.g., modules/quota/NavigatorStorageQuota.cpp)

[jkarlin, 2014/05/28 13:31:30]

Done.

+}
+
+} // namespace WebCore