Add profiling_controller that manages profilers.

tools/telemetry/telemetry/core/platform/profiling_controller.py

Index: tools/telemetry/telemetry/core/platform/profiling_controller.py
diff --git a/tools/telemetry/telemetry/core/platform/profiling_controller.py b/tools/telemetry/telemetry/core/platform/profiling_controller.py
new file mode 100644
index 0000000000000000000000000000000000000000..167f03893b349059c5b1712f17dff26ed7c14161
--- /dev/null
+++ b/tools/telemetry/telemetry/core/platform/profiling_controller.py
@@ -0,0 +1,15 @@
+# Copyright 2014 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.
+
+
+class ProfilingController(object):
+  def __init__(self, profiling_controller_backend):
+    self._profiling_controller_backend = profiling_controller_backend
+
+  def Start(self, profiler_name, base_output_file):
+    self._profiling_controller_backend.Start(
+        profiler_name, base_output_file)
+
+  def Stop(self):
+    return self._profiling_controller_backend.Stop()