cc: Move worker threads to content.

cc/test/test_task_graph_runner.cc

Index: cc/test/test_task_graph_runner.cc
diff --git a/cc/test/test_task_graph_runner.cc b/cc/test/test_task_graph_runner.cc
new file mode 100644
index 0000000000000000000000000000000000000000..fe9734e4024b353ca6d33400ad6d64ce53f0d271
--- /dev/null
+++ b/cc/test/test_task_graph_runner.cc
@@ -0,0 +1,23 @@
+// Copyright 2015 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 "cc/test/test_task_graph_runner.h"
+
+namespace cc {
+
+TestTaskGraphRunner::TestTaskGraphRunner()
+    : worker_thread_(this, "CompositorWorker") {
+  worker_thread_.Start();
+}
+
+TestTaskGraphRunner::~TestTaskGraphRunner() {
+  TaskGraphRunner::Shutdown();
+  worker_thread_.Join();
+}
+
+void TestTaskGraphRunner::Run() {
+  TaskGraphRunner::Run();
+}
+
+}  // namespace cc