Fix Volume slider is captured in screenshot done in touchview mode

chromeos/dbus/fake_cras_audio_client.cc

Index: chromeos/dbus/fake_cras_audio_client.cc
diff --git a/chromeos/dbus/fake_cras_audio_client.cc b/chromeos/dbus/fake_cras_audio_client.cc
index 3ee4c4d45a829f735ae5d2ba5c8aaf77da0a7cb8..ad8d24c5632afc1ff4f4fece2a3bf022fbe98648 100644
--- a/chromeos/dbus/fake_cras_audio_client.cc
+++ b/chromeos/dbus/fake_cras_audio_client.cc
@@ -227,6 +227,10 @@ void FakeCrasAudioClient::NotifyOutputNodeVolumeChangedForTesting(
                     OutputNodeVolumeChanged(node_id, volume));
 }
 
+void FakeCrasAudioClient::NotifyAudioClientRestartedForTesting() {
+  FOR_EACH_OBSERVER(Observer, observers_, AudioClientRestarted());
+}
+
 AudioNodeList::iterator FakeCrasAudioClient::FindNode(uint64_t node_id) {
   return std::find_if(
       node_list_.begin(), node_list_.end(),