Unit tests of AudioInputRendererHost. Some cleanups.

media/audio/audio_input_controller.cc

Index: media/audio/audio_input_controller.cc
diff --git a/media/audio/audio_input_controller.cc b/media/audio/audio_input_controller.cc
index 6391c9e10b2a6b30be28d8ce6d99952ac7a1a9ee..6bef6873d6ed8ba16cebc1f971ee5f76a88d4f8e 100644
--- a/media/audio/audio_input_controller.cc
+++ b/media/audio/audio_input_controller.cc
@@ -128,9 +128,11 @@ scoped_refptr<AudioInputController> AudioInputController::Create(
     return nullptr;
 
   if (factory_) {
-    return factory_->Create(
-        audio_manager, event_handler, params, user_input_monitor);
+    return factory_->Create(audio_manager->GetTaskRunner(),
+                            /*sync_writer*/ nullptr, audio_manager,
+                            event_handler, params, user_input_monitor);
   }
+
   scoped_refptr<AudioInputController> controller(new AudioInputController(
       event_handler, nullptr, nullptr, user_input_monitor, false));
 
@@ -167,6 +169,12 @@ scoped_refptr<AudioInputController> AudioInputController::CreateLowLatency(
   if (!params.IsValid() || (params.channels() > kMaxInputChannels))
     return nullptr;
 
+  if (factory_) {
+    return factory_->Create(audio_manager->GetTaskRunner(), sync_writer,
+                            audio_manager, event_handler, params,
+                            user_input_monitor);
+  }
+
   // Create the AudioInputController object and ensure that it runs on
   // the audio-manager thread.
   scoped_refptr<AudioInputController> controller(new AudioInputController(
@@ -200,6 +208,12 @@ scoped_refptr<AudioInputController> AudioInputController::CreateForStream(
   DCHECK(sync_writer);
   DCHECK(stream);
 
+  if (factory_) {
+    return factory_->Create(
+        task_runner, sync_writer, AudioManager::Get(), event_handler,
+        media::AudioParameters::UnavailableDeviceParams(), user_input_monitor);
+  }
+
   // Create the AudioInputController object and ensure that it runs on
   // the audio-manager thread.
   scoped_refptr<AudioInputController> controller(new AudioInputController(