Fix Volume slider is captured in screenshot done in touchview mode

chromeos/audio/cras_audio_handler_unittest.cc

 // 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.
 
 #include "chromeos/audio/cras_audio_handler.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <memory>
@@ skipping 1954 matching lines @@
   EXPECT_FALSE(cras_audio_handler_->IsInputMuted());
   EXPECT_EQ(2, test_observer_->input_mute_changed_count());
 }
 
 TEST_F(CrasAudioHandlerTest, SetOutputVolumePercent) {
   AudioNodeList audio_nodes;
   audio_nodes.push_back(kInternalSpeaker);
   SetUpCrasAudioHandler(audio_nodes);
   EXPECT_EQ(0, test_observer_->output_volume_changed_count());
 
-  cras_audio_handler_->SetOutputVolumePercent(60);
+  const int kVolume = 60;
+  cras_audio_handler_->SetOutputVolumePercent(kVolume);
 
   // Verify the output volume is changed to the designated value,
   // OnOutputNodeVolumeChanged event is fired, and the device volume value
-  // is saved the preferences.
-  const int kVolume = 60;
+  // is saved in the preferences.
   EXPECT_EQ(kVolume, cras_audio_handler_->GetOutputVolumePercent());
   EXPECT_EQ(1, test_observer_->output_volume_changed_count());
   AudioDevice device;
   EXPECT_TRUE(cras_audio_handler_->GetPrimaryActiveOutputDevice(&device));
   EXPECT_EQ(device.id, kInternalSpeaker.id);
   EXPECT_EQ(kVolume, audio_pref_handler_->GetOutputVolumeValue(&device));
 }
 
+TEST_F(CrasAudioHandlerTest, SetOutputVolumePercentWithoutNotifyingObservers) {
+  AudioNodeList audio_nodes;
+  audio_nodes.push_back(kInternalSpeaker);
+  SetUpCrasAudioHandler(audio_nodes);
+  EXPECT_EQ(0, test_observer_->output_volume_changed_count());
+
+  const int kVolume1 = 60;
+  const int kVolume2 = 80;
+  cras_audio_handler_->SetOutputVolumePercentWithoutNotifyingObservers(
+      kVolume1, CrasAudioHandler::VOLUME_CHANGE_MAXIMIZE_MODE_SCREENSHOT);
+  // Verify the output volume is changed to the designated value,
+  // OnOutputNodeVolumeChanged event is not fired, and the device volume value
+  // is saved in the preferences.
+  EXPECT_EQ(kVolume1, cras_audio_handler_->GetOutputVolumePercent());
+  EXPECT_EQ(0, test_observer_->output_volume_changed_count());
+  AudioDevice device;
+  EXPECT_TRUE(cras_audio_handler_->GetPrimaryActiveOutputDevice(&device));
+  EXPECT_EQ(device.id, kInternalSpeaker.id);
+  EXPECT_EQ(kVolume1, audio_pref_handler_->GetOutputVolumeValue(&device));
+
+  // Make another SetOutputVolumePercentWithoutNotifyingObservers call to make
+  // sure everything is right.
+  cras_audio_handler_->SetOutputVolumePercentWithoutNotifyingObservers(
+      kVolume2, CrasAudioHandler::VOLUME_CHANGE_MAXIMIZE_MODE_SCREENSHOT);
+  EXPECT_EQ(kVolume2, cras_audio_handler_->GetOutputVolumePercent());
+  EXPECT_EQ(0, test_observer_->output_volume_changed_count());
+  EXPECT_TRUE(cras_audio_handler_->GetPrimaryActiveOutputDevice(&device));
+  EXPECT_EQ(device.id, kInternalSpeaker.id);
+  EXPECT_EQ(kVolume2, audio_pref_handler_->GetOutputVolumeValue(&device));
+
+  // Make a final SetOutputVolumePercent call to check if
+  // SetOutputVolumePercentWithoutNotifyingObservers may block subsequent
+  // notifying observers.
+  cras_audio_handler_->SetOutputVolumePercent(kVolume1);
+  EXPECT_EQ(kVolume1, cras_audio_handler_->GetOutputVolumePercent());
+  EXPECT_EQ(1, test_observer_->output_volume_changed_count());
+  EXPECT_TRUE(cras_audio_handler_->GetPrimaryActiveOutputDevice(&device));
+  EXPECT_EQ(device.id, kInternalSpeaker.id);
+  EXPECT_EQ(kVolume1, audio_pref_handler_->GetOutputVolumeValue(&device));
+}
+
 TEST_F(CrasAudioHandlerTest, SetOutputVolumeWithDelayedSignal) {
   AudioNodeList audio_nodes;
   audio_nodes.push_back(kInternalSpeaker);
   SetUpCrasAudioHandler(audio_nodes);
   EXPECT_EQ(0, test_observer_->output_volume_changed_count());
 
   const int kDefaultVolume = 75;
   EXPECT_EQ(kDefaultVolume, cras_audio_handler_->GetOutputVolumePercent());
 
   // Disable the auto OutputNodeVolumeChanged signal.
@@ skipping 1268 matching lines @@
       cras_audio_handler_->GetPrimaryActiveOutputDevice(&active_output));
   EXPECT_EQ(kInternalSpeaker.id, active_output.id);
   EXPECT_EQ(kInternalSpeaker.id,
             cras_audio_handler_->GetPrimaryActiveOutputNode());
   EXPECT_FALSE(cras_audio_handler_->IsOutputMuted());
   EXPECT_EQ(1, test_observer_->output_mute_changed_count());
   EXPECT_TRUE(test_observer_->output_mute_by_system());
 }
 
 }  // namespace chromeos