Add GetAssociatedOutputDeviceID support to pulse.

content/browser/renderer_host/media/audio_input_device_manager.cc

Index: content/browser/renderer_host/media/audio_input_device_manager.cc
diff --git a/content/browser/renderer_host/media/audio_input_device_manager.cc b/content/browser/renderer_host/media/audio_input_device_manager.cc
index ffdfe2aa9ff19281dd779c621d34cbee794fa589..a4a2c126f6a8d15ab2c0e7d944ad458d35dabc03 100644
--- a/content/browser/renderer_host/media/audio_input_device_manager.cc
+++ b/content/browser/renderer_host/media/audio_input_device_manager.cc
@@ -180,6 +180,12 @@ void AudioInputDeviceManager::EnumerateOnDeviceThread(
     devices->push_back(StreamDeviceInfo(
         stream_type, it->device_name, it->unique_id));
   }
+  for (StreamDeviceInfo& device_info : *devices) {
+    if (IsAudioInputMediaType(device_info.device.type)) {
+      device_info.device.matched_output_device_id =
+          audio_manager_->GetAssociatedOutputDeviceID(device_info.device.id);
+    }
+  }
 
   // Return the device list through the listener by posting a task on
   // IO thread since MediaStreamManager handles the callback asynchronously.