Update mojo sdk to rev e7270700d671fa8e458b4d8c9e47f7bcfb65da0b

third_party/mojo/src/mojo/public/cpp/environment/lib/default_task_tracker.h

Index: third_party/mojo/src/mojo/public/cpp/environment/lib/default_task_tracker.h
diff --git a/third_party/mojo/src/mojo/public/cpp/environment/lib/default_task_tracker.h b/third_party/mojo/src/mojo/public/cpp/environment/lib/default_task_tracker.h
new file mode 100644
index 0000000000000000000000000000000000000000..83b9ae3c9bf4bb2fc6ea6bd167294804dfa58868
--- /dev/null
+++ b/third_party/mojo/src/mojo/public/cpp/environment/lib/default_task_tracker.h
@@ -0,0 +1,18 @@
+// 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 MOJO_PUBLIC_CPP_ENVIRONMENT_LIB_DEFAULT_TASK_TRACKER_H_
+#define MOJO_PUBLIC_CPP_ENVIRONMENT_LIB_DEFAULT_TASK_TRACKER_H_
+
+#include "mojo/public/cpp/environment/task_tracker.h"
+
+namespace mojo {
+namespace internal {
+
+extern const TaskTracker kDefaultTaskTracker;
+
+}  // namespace internal
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_ENVIRONMENT_LIB_DEFAULT_TASK_TRACKER_H_