Add a new audio extension event OnLevelChanged.

extensions/browser/api/audio/audio_apitest.cc

Index: extensions/browser/api/audio/audio_apitest.cc
diff --git a/extensions/browser/api/audio/audio_apitest.cc b/extensions/browser/api/audio/audio_apitest.cc
index 7194802a73d2317c6bf8bdfdf1ed55df57da5e13..2e22b4571e1e9c7625a2113e16580761b1279732 100644
--- a/extensions/browser/api/audio/audio_apitest.cc
+++ b/extensions/browser/api/audio/audio_apitest.cc
@@ -2,16 +2,139 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "base/message_loop/message_loop.h"
 #include "extensions/shell/test/shell_apitest.h"
+#if defined(OS_CHROMEOS)
+#include "chromeos/audio/audio_devices_pref_handler_stub.h"
+#include "chromeos/audio/cras_audio_handler.h"
+#include "chromeos/dbus/dbus_thread_manager.h"
+#include "chromeos/dbus/fake_cras_audio_client.h"
+#endif
+#include "extensions/test/extension_test_message_listener.h"
 
 namespace extensions {
 
-using AudioApiTest = ShellApiTest;
-
 #if defined(OS_CHROMEOS)
+using chromeos::AudioDevice;
+using chromeos::AudioDeviceList;
+using chromeos::AudioNode;
+using chromeos::AudioNodeList;
+
+const uint64 kJabraSpeaker1Id = 30001;
+const uint64 kJabraSpeaker2Id = 30002;
+const uint64 kHDMIOutputId = 30003;
+const uint64 kJabraMic1Id = 40001;
+const uint64 kJabraMic2Id = 40002;
+const uint64 kWebcamMicId = 40003;
+
+const AudioNode kJabraSpeaker1(false,
+                               kJabraSpeaker1Id,
+                               "Jabra Speaker",
+                               "USB",
+                               "Jabra Speaker 1",
+                               false,
+                               0);
+
+const AudioNode kJabraSpeaker2(false,
+                               kJabraSpeaker2Id,
+                               "Jabra Speaker",
+                               "USB",
+                               "Jabra Speaker 2",
+                               false,
+                               0);
+
+const AudioNode kHDMIOutput(false,
+                            kHDMIOutputId,
+                            "HDMI output",
+                            "HDMI",
+                            "HDA Intel MID",
+                            false,
+                            0);
+
+const AudioNode
+    kJabraMic1(true, kJabraMic1Id, "Jabra Mic", "USB", "Jabra Mic 1", false, 0);
+
+const AudioNode
+    kJabraMic2(true, kJabraMic2Id, "Jabra Mic", "USB", "Jabra Mic 2", false, 0);
+
+const AudioNode kUSBCameraMic(true,
+                              kWebcamMicId,
+                              "Webcam Mic",
+                              "USB",
+                              "Logitech Webcam",
+                              false,
+                              0);
+
+class AudioApiTest : public ShellApiTest {
+ public:
+  AudioApiTest() : cras_audio_handler_(NULL) {}
+  ~AudioApiTest() override {}
+
+  void SetUpCrasAudioHandlerWithTestingNodes(const AudioNodeList& audio_nodes) {
+    chromeos::DBusThreadManager* dbus_manager =
+        chromeos::DBusThreadManager::Get();
+    DCHECK(dbus_manager);
+    chromeos::FakeCrasAudioClient* fake_cras_audio_client =
+        static_cast<chromeos::FakeCrasAudioClient*>(
+            dbus_manager->GetCrasAudioClient());
+    fake_cras_audio_client->SetAudioNodesAndNotifyObserversForTesting(
+        audio_nodes);
+    cras_audio_handler_ = chromeos::CrasAudioHandler::Get();
+    DCHECK(cras_audio_handler_);
+    message_loop_.RunUntilIdle();
+  }
+
+ protected:
+  base::MessageLoopForUI message_loop_;
+  chromeos::CrasAudioHandler* cras_audio_handler_;  // Not owned.
+};
+
 IN_PROC_BROWSER_TEST_F(AudioApiTest, Audio) {
+  // Set up the audio nodes for testing.
+  AudioNodeList audio_nodes;
+  audio_nodes.push_back(kJabraSpeaker1);
+  audio_nodes.push_back(kJabraSpeaker2);
+  audio_nodes.push_back(kHDMIOutput);
+  audio_nodes.push_back(kJabraMic1);
+  audio_nodes.push_back(kJabraMic2);
+  audio_nodes.push_back(kUSBCameraMic);
+  SetUpCrasAudioHandlerWithTestingNodes(audio_nodes);
+
   EXPECT_TRUE(RunAppTest("api_test/audio")) << message_;
 }
-#endif
+
+IN_PROC_BROWSER_TEST_F(AudioApiTest, OnOutputNodeVolumeChanged) {
+  AudioNodeList audio_nodes;
+  audio_nodes.push_back(kJabraSpeaker1);
+  audio_nodes.push_back(kHDMIOutput);
+  SetUpCrasAudioHandlerWithTestingNodes(audio_nodes);
+
+  // Verify the jabra speaker is the active output device.
+  AudioDevice device;
+  EXPECT_TRUE(cras_audio_handler_->GetPrimaryActiveOutputDevice(&device));
+  EXPECT_EQ(device.id, kJabraSpeaker1.id);
+
+  // Loads background app.
+  ExtensionTestMessageListener load_listener("loaded", false);
+  ExtensionTestMessageListener result_listener("success", false);
+  result_listener.set_failure_message("failure");
+  ASSERT_TRUE(LoadApp("api_test/audio/volume_change"));
+  ASSERT_TRUE(load_listener.WaitUntilSatisfied());
+
+  // Change output device volume.
+  const int kVolume = 60;
+  cras_audio_handler_->SetOutputVolumePercent(kVolume);
+
+  // Verify the output volume is changed to the designated value.
+  EXPECT_EQ(kVolume, cras_audio_handler_->GetOutputVolumePercent());
+  EXPECT_EQ(kVolume,
+            cras_audio_handler_->GetOutputVolumePercentForDevice(device.id));
+
+  // Verify the background app got the OnOutputNodeVolumeChanged event
+  // with the expected node id and volume value.
+  ASSERT_TRUE(result_listener.WaitUntilSatisfied());
+  EXPECT_EQ("success", result_listener.message());
+}
+#endif  // OS_CHROMEOS
 
 }  // namespace extensions