Telemetry: allow user to specify source type for synthetic gestures.

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 54 matching lines @@
 
   @property
   def supports_extensions(self):
     return self._browser_backend.supports_extensions
 
   @property
   def supports_tab_control(self):
     return self._browser_backend.supports_tab_control
 
   @property
+  def synthetic_gesture_source_type(self):
+    return self._browser_backend.browser_options.synthetic_gesture_source_type
+
+  @property
   def tabs(self):
     return self._tabs
 
   @property
   def extensions(self):
     """Returns the extension dictionary if it exists."""
     if not self.supports_extensions:
       raise browser_backend.ExtensionsNotSupportedException(
           'Extensions not supported')
     return self._extensions
@@ skipping 276 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()