Fix Volume slider is captured in screenshot done in touchview mode

chromeos/dbus/fake_cras_audio_client.h

 // Copyright (c) 2013 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 CHROMEOS_DBUS_FAKE_CRAS_AUDIO_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_CRAS_AUDIO_CLIENT_H_
 
 #include <stdint.h>
 
 #include "base/macros.h"
@@ skipping 45 matching lines @@
   // Updates |node_list_| to contain |audio_nodes|.
   void SetAudioNodesForTesting(const AudioNodeList& audio_nodes);
 
   // Calls SetAudioNodesForTesting() and additionally notifies |observers_|.
   void SetAudioNodesAndNotifyObserversForTesting(
       const AudioNodeList& new_nodes);
 
   // Generates fake signal for OutputNodeVolumeChanged.
   void NotifyOutputNodeVolumeChangedForTesting(uint64_t node_id, int volume);
 
+  // Generates fake signal for AudioClientRestarted.
+  void NotifyAudioClientRestartedForTesting(const AudioNodeList& new_nodes);

[Daniel Erat, 2016/08/04 00:58:19]

minor nit: since the node list isn't part of the notification, it might be
better to just make this method take no params and have tests call the other
method to set the nodes first.

[Qiang(Joe) Xu, 2016/08/04 04:02:15]

Done.

+
   const AudioNodeList& node_list() const { return node_list_; }
   const uint64_t& active_input_node_id() const { return active_input_node_id_; }
   const uint64_t& active_output_node_id() const {
     return active_output_node_id_;
   }
   void set_notify_volume_change_with_delay(bool notify_with_delay) {
     notify_volume_change_with_delay_ = notify_with_delay;
   }
 
  private:
   // Finds a node in the list based on the id.
   AudioNodeList::iterator FindNode(uint64_t node_id);
 
   VolumeState volume_state_;
   AudioNodeList node_list_;
   uint64_t active_input_node_id_;
   uint64_t active_output_node_id_;
   // By default, immediately sends OutputNodeVolumeChange signal following the
   // SetOutputNodeVolume fake dbus call.
   bool notify_volume_change_with_delay_ = false;
   base::ObserverList<Observer> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeCrasAudioClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_CRAS_AUDIO_CLIENT_H_