Make sure snap_page combined iframe serialized dom

telemetry/telemetry/internal/browser/web_contents.py

 # Copyright 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 exceptions
 
 from py_trace_event import trace_event
 
@@ skipping 221 matching lines @@
 
     Raises:
       py_utils.TimeoutException
       exceptions.EvaluationException
       exceptions.WebSocketException
       exceptions.DevtoolsTargetCrashException
     """
     return self._inspector_backend.WaitForJavaScriptCondition(*args, **kwargs)
 
   def EnableAllContexts(self):
-    """Enable all contexts in a page. Returns the number of available contexts.
+    """Enable all contexts in a page. Returns all available context ids.
+
+    Returns:
+      A list of frame context ids. Each |context_id| can be used for
+      executing Javascript in the corresponding iframe through
+      tab.ExecuteJavaScript(..., context_id=context_id) and
+      ab.EvaluateJavaScript(..., context_id=context_id).

[wkorman, 2017/09/20 20:11:04]

Missing 't'

 
     Raises:
       exceptions.WebSocketDisconnected
       py_utils.TimeoutException
       exceptions.DevtoolsTargetCrashException
     """
     return self._inspector_backend.EnableAllContexts()
 
   def WaitForNavigate(self, timeout=DEFAULT_WEB_CONTENTS_TIMEOUT):
     """Waits for the navigation to complete.
@@ skipping 120 matching lines @@
       exceptions.DevtoolsTargetCrashException
     """
     return self._inspector_backend.DispatchKeyEvent(
         key_event_type=key_event_type, modifiers=modifiers, timestamp=timestamp,
         text=text, unmodified_text=unmodified_text,
         key_identifier=key_identifier, dom_code=dom_code, dom_key=dom_key,
         windows_virtual_key_code=windows_virtual_key_code,
         native_virtual_key_code=native_virtual_key_code,
         auto_repeat=auto_repeat, is_keypad=is_keypad,
         is_system_key=is_system_key, timeout=timeout)