Create video and audio decoder threads on demand.

media/base/message_loop_factory_for_test.cc

Index: media/base/message_loop_factory_for_test.cc
diff --git a/media/base/message_loop_factory_for_test.cc b/media/base/message_loop_factory_for_test.cc
new file mode 100644
index 0000000000000000000000000000000000000000..44897a67ced632d3ac37caf8c0d767fa66c5840e
--- /dev/null
+++ b/media/base/message_loop_factory_for_test.cc
@@ -0,0 +1,22 @@
+// Copyright (c) 2012 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/base/message_loop_factory_for_test.h"
+
+namespace media {
+
+MessageLoopFactoryForTest::MessageLoopFactoryForTest(
+    MessageLoop* the_only_loop)
+    : the_only_loop_(the_only_loop) {
+}
+
+MessageLoopFactoryForTest::~MessageLoopFactoryForTest() {
+}
+
+MessageLoop* MessageLoopFactoryForTest::GetMessageLoop(
+    const std::string& name) {
+  return the_only_loop_;
+}
+
+}  // namespace media