Link things together and enable the device selection for linux and mac.

media/audio/win/audio_manager_win.cc

Index: media/audio/win/audio_manager_win.cc
diff --git a/media/audio/win/audio_manager_win.cc b/media/audio/win/audio_manager_win.cc
index e9c1d20ca79f297ab72dca2371621f9a01e5e209..4add5bb5b6feee49027a24e528c0e0bc8fb76126 100644
--- a/media/audio/win/audio_manager_win.cc
+++ b/media/audio/win/audio_manager_win.cc
@@ -140,7 +140,7 @@ AudioOutputStream* AudioManagerWin::MakeAudioOutputStream(
 
 // Factory for the implementations of AudioInputStream.
 AudioInputStream* AudioManagerWin::MakeAudioInputStream(
-    const AudioParameters& params) {
+    const AudioParameters& params, const std::string& device_id) {
   if (!params.IsValid() || (params.channels > kWinMaxInputChannels))
     return NULL;
 
@@ -153,12 +153,16 @@ AudioInputStream* AudioManagerWin::MakeAudioInputStream(
     if (base::win::GetVersion() <= base::win::VERSION_XP) {
       // Fall back to Windows Wave implementation on Windows XP or lower.
       DLOG(INFO) << "Using WaveIn since WASAPI requires at least Vista.";
-      return new PCMWaveInAudioInputStream(this, params, kNumInputBuffers,
-                                           WAVE_MAPPER);
+      // TODO(xians): Handle the non-default device.
+      if (device_id == AudioManagerBase::kDefaultDeviceId)
+        return new PCMWaveInAudioInputStream(this, params, kNumInputBuffers,
+                                             WAVE_MAPPER);
     } else {
       // TODO(henrika): improve possibility to specify audio endpoint.
       // Use the default device (same as for Wave) for now to be compatible.
-      return new WASAPIAudioInputStream(this, params, eConsole);
+      // TODO(xians): Handle the non-default device.
+      if (device_id == AudioManagerBase::kDefaultDeviceId)
+        return new WASAPIAudioInputStream(this, params, eConsole);
     }
   }
   return NULL;
@@ -274,7 +278,7 @@ void AudioManagerWin::GetAudioInputDeviceNames(
     // default devices.
     media::AudioDeviceName name;
     name.device_name = AudioManagerBase::kDefaultDeviceName;
-    name.unique_id = "0";
+    name.unique_id = AudioManagerBase::kDefaultDeviceId;
     device_names->push_back(name);
   }
 }