Browser Plugin: Only install BrowserPluginMessageFilter if render process supports BrowserPlugin.

content/public/browser/content_browser_client.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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 #define CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_
 
 #include <map>
 #include <string>
 #include <utility>
@@ skipping 460 matching lines @@
 
   // Notification that a pepper plugin has just been spawned. This allows the
   // embedder to add filters onto the host to implement interfaces.
   // This is called on the IO thread.
   virtual void DidCreatePpapiPlugin(BrowserPpapiHost* browser_host) {}
 
   // Gets the host for an external out-of-process plugin.
   virtual content::BrowserPpapiHost* GetExternalBrowserPpapiHost(
       int plugin_child_id);
 
+  // Returns true if the given browser_context and site_url support hosting
+  // BrowserPlugins.
+  virtual bool SupportsBrowserPlugin(BrowserContext* browser_context,
+                                     const GURL& site_url);
+
   // Returns true if renderer processes can use Pepper TCP/UDP sockets from
   // the given origin and connection type.
   virtual bool AllowPepperSocketAPI(BrowserContext* browser_context,
                                     const GURL& url,
                                     const SocketPermissionRequest& params);
 
   // Returns the directory containing hyphenation dictionaries.
   virtual base::FilePath GetHyphenDictionaryDirectory();
 
   // Returns an implementation of a file selecition policy. Can return NULL.
@@ skipping 25 matching lines @@
   // This is called on a worker thread.
   virtual
       crypto::CryptoModuleBlockingPasswordDelegate* GetCryptoPasswordDelegate(
           const GURL& url);
 #endif
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_CONTENT_BROWSER_CLIENT_H_