Add use-chromium-style-naming option to Blink GC plugin.

tools/clang/blink_gc_plugin/BlinkGCPluginOptions.h

 // Copyright 2015 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.
 
 #ifndef TOOLS_BLINK_GC_PLUGIN_BLINK_GC_PLUGIN_OPTIONS_H_
 #define TOOLS_BLINK_GC_PLUGIN_BLINK_GC_PLUGIN_OPTIONS_H_
 
 #include <set>
 #include <string>
 #include <vector>
 
 struct BlinkGCPluginOptions {
-  BlinkGCPluginOptions()
-      : dump_graph(false),
-        warn_unneeded_finalizer(false) {}
-  bool dump_graph;
-  bool warn_unneeded_finalizer;
+  bool dump_graph = false;
+  bool warn_unneeded_finalizer = false;
+  bool use_chromium_style_naming = false;
   std::set<std::string> ignored_classes;
   std::set<std::string> checked_namespaces;
   std::vector<std::string> ignored_directories;
 };
 
 #endif  // TOOLS_BLINK_GC_PLUGIN_BLINK_GC_PLUGIN_OPTIONS_H_