Add a flag to app_shell that allows roaming on cellular networks

extensions/shell/browser/shell_network_controller_chromeos.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 EXTENSIONS_SHELL_BROWSER_SHELL_NETWORK_CONTROLLER_CHROMEOS_H_
 #define EXTENSIONS_SHELL_BROWSER_SHELL_NETWORK_CONTROLLER_CHROMEOS_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 12 matching lines @@
   // This class must be instantiated after chromeos::DBusThreadManager and
   // destroyed before it.
   explicit ShellNetworkController(const std::string& preferred_network_name);
   ~ShellNetworkController() override;
 
   // chromeos::NetworkStateHandlerObserver overrides:
   void NetworkListChanged() override;
   void NetworkConnectionStateChanged(
       const chromeos::NetworkState* state) override;
 
+  // Control whether the cellular network connection allows roaming.
+  void SetCellularAllowRoaming(bool allow_roaming);
+
  private:
   // State of communication with the connection manager.
   enum State {
     // No in-progress requests.
     STATE_IDLE = 0,
     // Waiting for the result of an attempt to connect to the preferred network.
     STATE_WAITING_FOR_PREFERRED_RESULT,
     // Waiting for the result of an attempt to connect to a non-preferred
     // network.
     STATE_WAITING_FOR_NON_PREFERRED_RESULT,
@@ skipping 34 matching lines @@
   bool preferred_network_is_active_;
 
   base::WeakPtrFactory<ShellNetworkController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellNetworkController);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_SHELL_BROWSER_SHELL_NETWORK_CONTROLLER_CHROMEOS_H_