Skeleton GCMAppHandler for Push API

components/gcm_driver/gcm_app_handler.h

Index: components/gcm_driver/gcm_app_handler.h
diff --git a/components/gcm_driver/gcm_app_handler.h b/components/gcm_driver/gcm_app_handler.h
index 31bab34d8905a19e5d36fd75ac13fc25dd642a13..84189080817f759cb33154777ee575e1bd1d965c 100644
--- a/components/gcm_driver/gcm_app_handler.h
+++ b/components/gcm_driver/gcm_app_handler.h
@@ -37,6 +37,18 @@ class GCMAppHandler {
       const GCMClient::SendErrorDetails& send_error_details) = 0;
 };
 
+class GCMWildcardAppHandler : public GCMAppHandler {
+ public:
+  GCMWildcardAppHandler() {}
+  virtual ~GCMWildcardAppHandler() {}
+
+  // If no ordinary app handler has been added with the exact app_id of an
+  // incoming event, all GCMWildcardAppHandlers will be asked (in arbitrary
+  // order) whether they can handle the app_id, and the first to return true
+  // will receive the event.
+  virtual bool CanHandle(const std::string& app_id) const = 0;
+};
+
 }  // namespace gcm
 
 #endif  // COMPONENTS_GCM_DRIVER_GCM_APP_HANDLER_H_