Reland of [DevTools] Move screen orientation override to RenderWidgetScreenMetricsEmulator.

content/browser/devtools/protocol/devtools_protocol_handler_generator.py

 #!/usr/bin/env python
 # 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 sys
 import string
 import json
 
 blink_protocol_path = sys.argv[1]
@@ skipping 550 matching lines @@
       item_raw_type = items_map["raw_type"],
       item_pass = items_map["pass_template"].substitute(name="item", opt=""),
       ItemType = items_map["Type"])
   mapping["arg_out"] = "&out_%s" % mapping["param"]
 
 def ResolveObject(json, mapping):
   mapping["Type"] = "Dictionary"
   mapping["storage_type"] = "scoped_ptr<base::DictionaryValue>"
   mapping["raw_type"] = "base::DictionaryValue*"
   mapping["pass_template"] = tmpl_object_pass
+  mapping["init"] = " = nullptr"
   if "properties" in json:
     if not "declared_name" in mapping:
       mapping["declared_name"] = ("%s%s" %
           (mapping["Command"], Capitalize(mapping["proto_param"])))
       mapping["param_type"] = ("scoped_refptr<%s>" %
           tmpl_typename.substitute(mapping))
       DeclareStruct(json["properties"], mapping)
     else:
       mapping["param_type"] = ("scoped_refptr<%s>" %
           tmpl_typename.substitute(mapping))
@@ skipping 215 matching lines @@
 output_h_file.close()
 
 output_cc_file.write(template_cc.substitute({},
     major = blink_protocol["version"]["major"],
     minor = blink_protocol["version"]["minor"],
     includes = "".join(sorted(includes)),
     fields_init = ",\n      ".join(fields_init),
     methods = "\n".join(handler_method_impls),
     types = "\n".join(type_impls)))
 output_cc_file.close()