Implement HasInputDevices in CrasAudioManager

chromeos/audio/audio_device.h

Index: chromeos/audio/audio_device.h
diff --git a/chromeos/audio/audio_device.h b/chromeos/audio/audio_device.h
index 67dca1cf338a04335be31cd510619681ef4ac0f4..e9b6a9e24235e541138f03a7df648b888069fc8d 100644
--- a/chromeos/audio/audio_device.h
+++ b/chromeos/audio/audio_device.h
@@ -41,6 +41,20 @@ struct CHROMEOS_EXPORT AudioDevice {
   static std::string GetTypeString(chromeos::AudioDeviceType type);
   static chromeos::AudioDeviceType GetAudioType(const std::string& node_type);
 
+  // Indicates that an input or output audio device is for simple usage like
+  // playback or recording for user. In contrast, audio device such as
+  // loopback, always on keyword recognition (AOKR), and keyboard mic are
+  // not for simple usage.
+  inline bool IsForSimpleUsage() {

[Daniel Erat, 2015/06/23 14:15:49]

you don't need 'inline' here, and you should use lowercase_with_underscore style
(https://www.chromium.org/developers/coding-style/cpp-dos-and-donts#TOC-Stop-i...):

bool is_for_simple_usage() {
  return ...
}

[cychiang, 2015/06/24 08:11:29]

Done.

+    return (type == AUDIO_TYPE_HEADPHONE ||
+            type == AUDIO_TYPE_INTERNAL_MIC ||
+            type == AUDIO_TYPE_MIC ||
+            type == AUDIO_TYPE_USB ||
+            type == AUDIO_TYPE_BLUETOOTH ||
+            type == AUDIO_TYPE_HDMI ||
+            type == AUDIO_TYPE_INTERNAL_SPEAKER);
+  }
+
   bool is_input;
   uint64 id;
   std::string display_name;