Introduce DevToolsExternalAgentProxy interface

content/public/browser/devtools_external_agent_proxy.h

Index: content/public/browser/devtools_external_agent_proxy.h
diff --git a/content/public/browser/devtools_external_agent_proxy.h b/content/public/browser/devtools_external_agent_proxy.h
new file mode 100644
index 0000000000000000000000000000000000000000..9e43c648a7e37b976f6b0f58483b12afea6ea7ab
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+++ b/content/public/browser/devtools_external_agent_proxy.h
@@ -0,0 +1,37 @@
+// Copyright (c) 2013 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 CONTENT_PUBLIC_BROWSER_DEVTOOLS_EXTERNAL_AGENT_PROXY_H_
+#define CONTENT_PUBLIC_BROWSER_DEVTOOLS_EXTERNAL_AGENT_PROXY_H_
+
+#include <string>
+
+#include "content/common/content_export.h"
+
+namespace content {
+
+class DevToolsAgentHost;
+class DevToolsExternalAgentProxyDelegate;
+
+// Describes interface for communication with an external DevTools agent.
+class DevToolsExternalAgentProxy {
+ public:
+  // Creates DevToolsExternalAgentProxy to communicate with an agent
+  // via the provided |delegate|.
+  // Caller get the proxy ownership and keeps the |delegate| ownership.
+  static CONTENT_EXPORT DevToolsExternalAgentProxy* Create(
+      DevToolsExternalAgentProxyDelegate* delegate);
+
+  // Returns the local DevToolsAgentHost for the external agent.
+  virtual scoped_refptr<DevToolsAgentHost> GetAgentHost() = 0;
+
+  // Informs the client that the connection has closed.
+  virtual void ConnectionClosed() = 0;
+
+  virtual ~DevToolsExternalAgentProxy() {}
+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_DEVTOOLS_EXTERNAL_AGENT_PROXY_H_