Make it possible to configure synthetic delays through Devtools

tools/telemetry/telemetry/core/browser.py

 # Copyright (c) 2012 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
 
 from telemetry.core import browser_credentials
 from telemetry.core import exceptions
 from telemetry.core import extension_dict
 from telemetry.core import platform
@@ skipping 241 matching lines @@
       output_files.extend(profiler.CollectProfile())
     self._active_profilers = []
     return output_files
 
   def StartTracing(self, custom_categories=None, timeout=10):
     return self._browser_backend.StartTracing(custom_categories, timeout)
 
   def StopTracing(self):
     return self._browser_backend.StopTracing()
 
+  @property
+  def supports_synthetic_delays(self):
+    return self._browser_backend.supports_synthetic_delays
+
+  def ConfigureSyntheticDelays(self, delays, timeout=10):
+    return self._browser_backend.ConfigureSyntheticDelays(delays, timeout)
+
   def Start(self):
     browser_options = self._browser_backend.browser_options
     if browser_options.clear_sytem_cache_for_browser_and_profile_on_start:
       if self._platform.CanFlushIndividualFilesFromSystemCache():
         self._platform.FlushSystemCacheForDirectory(
             self._browser_backend.profile_directory)
         self._platform.FlushSystemCacheForDirectory(
             self._browser_backend.browser_directory)
       else:
         self._platform.FlushEntireSystemCache()
@@ skipping 86 matching lines @@
 
   @property
   def supports_system_info(self):
     return self._browser_backend.supports_system_info
 
   def GetSystemInfo(self):
     """Returns low-level information about the system, if available.
 
        See the documentation of the SystemInfo class for more details."""
     return self._browser_backend.GetSystemInfo()