Allow unit tests to use a mock audio input controller.

media/audio/test_audio_input_controller_factory.cc

Index: media/audio/test_audio_input_controller_factory.cc
diff --git a/media/audio/test_audio_input_controller_factory.cc b/media/audio/test_audio_input_controller_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..c56afd8fe20f7530f5e87074048d370b522d74f0
--- /dev/null
+++ b/media/audio/test_audio_input_controller_factory.cc
@@ -0,0 +1,44 @@
+// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "media/audio/test_audio_input_controller_factory.h"
+#include "media/audio/audio_io.h"
+
+namespace media {
+
+TestAudioInputController::TestAudioInputController(
+    TestAudioInputControllerFactory* factory, EventHandler* event_handler)
+    : AudioInputController(event_handler),
+      factory_(factory),
+      event_handler_(event_handler) {
+}
+
+TestAudioInputController::~TestAudioInputController() {
+  // Inform the factory so that it allows creating new instances in future.
+  factory_->OnTestAudioInputControllerDestroyed(this);
+}
+
+TestAudioInputControllerFactory::TestAudioInputControllerFactory()
+    : controller_(NULL) {
+}
+
+AudioInputController* TestAudioInputControllerFactory::Create(
+    AudioInputController::EventHandler* event_handler,
+    AudioManager::Format format,
+    int channels,
+    int sample_rate,
+    int bits_per_sample,
+    int samples_per_packet) {
+  DCHECK(!controller_);  // Only one test instance managed at a time.
+  controller_ = new TestAudioInputController(this, event_handler);
+  return controller_;
+}
+
+void TestAudioInputControllerFactory::OnTestAudioInputControllerDestroyed(
+    TestAudioInputController* controller) {
+  DCHECK(controller_ == controller);
+  controller_ = NULL;
+}
+
+}  // namespace media