Add profiling_controller that manages profilers.

tools/perf/record_android_profile.py

 #!/usr/bin/env python
 # Copyright 2013 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.
 
 import os
 import sys
 import tempfile
 
 sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, 'telemetry'))
 
 from telemetry.core import browser_finder
 from telemetry.core import browser_options
 
 
 def _RunPrebuilt(options):
   browser_to_create = browser_finder.FindBrowser(options)
   with browser_to_create.Create() as browser:
     browser.Start()
     output_file = os.path.join(tempfile.mkdtemp(), options.profiler)
     raw_input('Press enter to start profiling...')
     print '>> Starting profiler', options.profiler
-    browser.StartProfiling(options.profiler, output_file)
+    browser.platform.profiling_controller.Start(
+        options.profiler, output_file)
     print 'Press enter or CTRL+C to stop'
     try:
       raw_input()
     except KeyboardInterrupt:
       pass
     finally:
-      browser.StopProfiling()
+      browser.platform.profiling_controller.Stop()
     print '<< Stopped profiler ', options.profiler
 
 
 if __name__ == '__main__':
   browser_finder_options = browser_options.BrowserFinderOptions()
   parser = browser_finder_options.CreateParser('')
   profiler_options, _ = parser.parse_args()
   sys.exit(_RunPrebuilt(profiler_options))