Make Web Push use InstanceID tokens instead of GCM registrations

chrome/browser/push_messaging/push_messaging_app_identifier.h

 // Copyright 2014 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_PUSH_MESSAGING_PUSH_MESSAGING_APP_IDENTIFIER_H_
 #define CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_APP_IDENTIFIER_H_
 
 #include <stddef.h>
 #include <stdint.h>
 #include <string>
@@ skipping 16 matching lines @@
 // perspective. These can be persisted to prefs, in a 1:1 mapping between
 // app_id (which includes origin) and service_worker_registration_id.
 // Legacy mapped values saved by old versions of Chrome are also supported;
 // these don't contain the origin in the app_id, so instead they map from
 // app_id to pair<origin, service_worker_registration_id>.
 class PushMessagingAppIdentifier {
  public:
   // Register profile-specific prefs.
   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
 
+  // Returns whether the modern InstanceID API should be used with this app_id
+  // (rather than legacy GCM registration).
+  static bool UseInstanceID(const std::string& app_id);
+
   // Generates a new app identifier, with partially random app_id.
   static PushMessagingAppIdentifier Generate(
       const GURL& origin,
       int64_t service_worker_registration_id);
 
   // Looks up an app identifier by app_id. If not found, is_null() will be true.
   static PushMessagingAppIdentifier FindByAppId(Profile* profile,
                                                 const std::string& app_id);
 
   // Looks up an app identifier by origin & service worker registration id.
@@ skipping 55 matching lines @@
 
   // Validates that all the fields contain valid values.
   void DCheckValid() const;
 
   std::string app_id_;
   GURL origin_;
   int64_t service_worker_registration_id_;
 };
 
 #endif  // CHROME_BROWSER_PUSH_MESSAGING_PUSH_MESSAGING_APP_IDENTIFIER_H_