Expose navigator.connect client side API in blink.

public/platform/WebNavigatorConnectProvider.h

Index: public/platform/WebNavigatorConnectProvider.h
diff --git a/public/platform/WebNavigatorConnectProvider.h b/public/platform/WebNavigatorConnectProvider.h
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+++ b/public/platform/WebNavigatorConnectProvider.h
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+// 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.
+
+#ifndef WebNavigatorConnectProvider_h
+#define WebNavigatorConnectProvider_h
+
+#include "WebCallbacks.h"
+
+namespace blink {
+
+class WebMessagePortChannel;
+class WebURL;
+
+class WebNavigatorConnectProvider {
+public:
+    virtual ~WebNavigatorConnectProvider() { }
+
+    // Initiates a connection to the given URL. When succesfull the service
+    // can communicate with the client over the given channel.
+    // Ownership of the WebMessagePortChannel and WebCallbacks is transferred to the provider.
+    virtual void connect(const WebURL&, WebMessagePortChannel*, WebCallbacks<void, void>*) { }
+};
+
+} // namespace blink
+
+#endif // WebNavigatorConnectProvider_h