Add profiling_controller that manages profilers.

tools/telemetry/telemetry/page/page_runner.py

 # 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.
 
 import collections
 import logging
 import optparse
 import os
 import random
 import sys
@@ skipping 117 matching lines @@
       self._append_to_existing_wpr = True
 
   def StartProfiling(self, page, finder_options):
     if not self.profiler_dir:
       self.profiler_dir = tempfile.mkdtemp()
     output_file = os.path.join(self.profiler_dir, page.file_safe_name)
     is_repeating = (finder_options.page_repeat != 1 or
                     finder_options.pageset_repeat != 1)
     if is_repeating:
       output_file = util.GetSequentialFileName(output_file)
-    self.browser.StartProfiling(finder_options.profiler, output_file)
+    self.browser.platform.profiling_controller.StartProfiling(
+        finder_options.profiler, output_file)
 
   def StopProfiling(self):
     if self.browser:
-      self.browser.StopProfiling()
+      self.browser.platform.profiling_controller.StopProfiling()
 
 
 class PageState(object):
   def __init__(self, page, tab):
     self.page = page
     self.tab = tab
 
     self._did_login = False
 
   def PreparePage(self, test=None):
@@ skipping 434 matching lines @@
     logging.warning('Device is thermally throttled before running '
                     'performance tests, results will vary.')
 
 
 def _CheckThermalThrottling(platform):
   if not platform.CanMonitorThermalThrottling():
     return
   if platform.HasBeenThermallyThrottled():
     logging.warning('Device has been thermally throttled during '
                     'performance tests, results will vary.')