Browser Plugin: Allocate Instance IDs in BrowserPluginEmbedder instead of BrowserPluginManager

content/browser/browser_plugin/browser_plugin_embedder.h

 // 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.
 
 // A BrowserPluginEmbedder has a list of guests it manages.
 // In the beginning when a renderer sees one or more guests (BrowserPlugin
 // instance(s)) and there is a request to navigate to them, the WebContents for
 // that renderer creates a BrowserPluginEmbedder for itself. The
 // BrowserPluginEmbedder, in turn, manages a set of BrowserPluginGuests -- one
 // BrowserPluginGuest for each guest in the embedding WebContents. Note that
@@ skipping 100 matching lines @@
   void CleanUp();
 
   // Called when visiblity of web_contents changes, so the embedder will
   // show/hide its guest.
   void WebContentsVisibilityChanged(bool visible);
 
   static bool ShouldForwardToBrowserPluginGuest(const IPC::Message& message);
 
   // Message handlers.
 
+  void OnAllocateInstanceID(int request_id);
   void OnCreateGuest(int instance_id,
                      const BrowserPluginHostMsg_CreateGuest_Params& params);
   void OnPluginAtPositionResponse(int instance_id,
                                   int request_id,
                                   const gfx::Point& position);
   void OnPluginDestroyed(int instance_id);
   void OnSwapBuffersACK(int route_id,
                         int gpu_host_id,
                         const std::string& mailbox_name,
                         uint32 sync_point);
@@ skipping 10 matching lines @@
   // Tracks the visibility state of the embedder.
   bool visible_;
   // Map that contains outstanding queries to |GetBrowserPluginAt|.
   // We need a roundtrip to renderer process to know the answer, therefore
   // storing these callbacks is required.
   typedef std::map<int, WebContents::GetRenderViewHostCallback>
       GetRenderViewHostCallbackMap;
   GetRenderViewHostCallbackMap pending_get_render_view_callbacks_;
   // Next request id for BrowserPluginMsg_PluginAtPositionRequest query.
   int next_get_render_view_request_id_;
+  int instance_counter_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginEmbedder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_H_