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diff --git a/content/renderer/browser_plugin/browser_plugin_manager.h b/content/renderer/browser_plugin/browser_plugin_manager.h
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+++ b/content/renderer/browser_plugin/browser_plugin_manager.h
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+// Copyright (c) 2012 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_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_
+#define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_
+
+#include "base/id_map.h"
+#include "base/threading/non_thread_safe.h"
+#include "content/public/renderer/render_process_observer.h"
+#include "ipc/ipc_sender.h"
+
+class RenderViewImpl;
+
+namespace WebKit {
+class WebFrame;
+struct WebPluginParams;
+}
+
+namespace content {
+
+class BrowserPlugin;
+
+// BrowserPluginManager manages the routing of messages to the appropriate
+// BrowserPlugin object based on its instance ID. There is only one
+// BrowserPluginManager per renderer process, and it should only be accessed
+// by the render thread.
+class CONTENT_EXPORT BrowserPluginManager : public IPC::Sender,
+                                            public RenderProcessObserver,
+                                            public base::NonThreadSafe {
+ public:
+  // Returns the one BrowserPluginManager for this process.
+  static BrowserPluginManager* Get();
+
+  BrowserPluginManager();
+  virtual ~BrowserPluginManager();
+
+  // Creates a new BrowserPlugin object with a unique identifier.
+  // BrowserPlugin is responsible for associating itself with the
+  // BrowserPluginManager via AddBrowserPlugin. When it is destroyed, it is
+  // responsible for removing its association via RemoveBrowserPlugin.
+  virtual BrowserPlugin* CreateBrowserPlugin(
+      RenderViewImpl* render_view,
+      WebKit::WebFrame* frame,
+      const WebKit::WebPluginParams& params) = 0;
+
+  void AddBrowserPlugin(int instance_id, BrowserPlugin* browser_plugin);
+  void RemoveBrowserPlugin(int instance_id);
+  BrowserPlugin* GetBrowserPlugin(int instance_id) const;
+
+ protected:
+  IDMap<BrowserPlugin> instances_;
+  int browser_plugin_counter_;
+};
+
+}  // namespace content
+
+#endif //  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_H_