Enable tracing in SkyShell

sky/shell/tracing_controller.h

Index: sky/shell/tracing_controller.h
diff --git a/sky/shell/tracing_controller.h b/sky/shell/tracing_controller.h
new file mode 100644
index 0000000000000000000000000000000000000000..4a3d3d561e09818ecbb9c10631bdbfb372689058
--- /dev/null
+++ b/sky/shell/tracing_controller.h
@@ -0,0 +1,19 @@
+// 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.
+
+#ifndef SKY_SHELL_TRACING_CONTROLLER_H_
+#define SKY_SHELL_TRACING_CONTROLLER_H_
+
+#include "base/android/jni_weak_ref.h"
+#include "base/android/scoped_java_ref.h"
+
+namespace sky {
+namespace shell {
+
+bool RegisterTracingController(JNIEnv* env);
+
+}  // namespace shell
+}  // namespace sky
+
+#endif  // SKY_SHELL_TRACING_CONTROLLER_H_