Add a check to the registry before the intent infobar is shown.

chrome/browser/intents/web_intents_registry.h

 // Copyright (c) 2011 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 CHROME_BROWSER_INTENTS_WEB_INTENTS_REGISTRY_H_
 #define CHROME_BROWSER_INTENTS_WEB_INTENTS_REGISTRY_H_
 #pragma once
 
+#include "base/callback.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile_keyed_service.h"
 #include "chrome/browser/webdata/web_data_service.h"
 #include "webkit/glue/web_intent_service_data.h"
 
 // Handles storing and retrieving of web intents in the web database.
 // The registry provides filtering logic to retrieve specific types of intents.
 class WebIntentsRegistry
@@ skipping 33 matching lines @@
   // Requests all intent providers matching |action| and |mimetype|.
   // |mimetype| can contain wildcards, i.e. "image/*" or "*".
   // |consumer| must not be NULL.
   QueryID GetIntentProviders(const string16& action,
                              const string16& mimetype,
                              Consumer* consumer);
 
   // Requests all intent providers. |consumer| must not be NULL
   QueryID GetAllIntentProviders(Consumer* consumer);
 
+  // Tests for the existence of the given intent |provider|. Calls the
+  // provided |callback| with true if it exists, false if it does not.
+  // Checks for |provider| equality with ==.
+  QueryID IntentProviderExists(
+      const webkit_glue::WebIntentServiceData& provider,
+      const base::Callback<void(bool)>& callback);
+
  protected:
   // Make sure that only WebIntentsRegistryFactory can create an instance of
   // WebIntentsRegistry.
   friend class WebIntentsRegistryFactory;
   friend class WebIntentsRegistryTest;
   friend class WebIntentsModelTest;
 
   WebIntentsRegistry();
   virtual ~WebIntentsRegistry();
 
@@ skipping 21 matching lines @@
   // Shutdown/cleanup is handled by ProfileImpl. We are  guaranteed that any
   // ProfileKeyedService will be shut down before data on ProfileImpl is
   // destroyed (i.e. |extension_service_|), so |extension_service_| is valid
   // for the lifetime of the WebIntentsRegistry object.
   ExtensionServiceInterface* extension_service_;
 
   DISALLOW_COPY_AND_ASSIGN(WebIntentsRegistry);
 };
 
 #endif  // CHROME_BROWSER_INTENTS_WEB_INTENTS_REGISTRY_H_