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

tools/clang/blink_gc_plugin/BlinkGCPluginConsumer.cpp

 // 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.
 
 #include "BlinkGCPluginConsumer.h"
 
 #include <algorithm>
 #include <set>
 
 #include "CheckDispatchVisitor.h"
@@ skipping 57 matching lines @@
     : instance_(instance),
       reporter_(instance),
       options_(options),
       cache_(instance),
       json_(0) {
   // Only check structures in the blink and WebKit namespaces.
   options_.checked_namespaces.insert("blink");
 
   // Ignore GC implementation files.
   options_.ignored_directories.push_back("/heap/");
+
+  if (!options_.use_chromium_style_naming)
+    Config::UseLegacyNames();
 }
 
 void BlinkGCPluginConsumer::HandleTranslationUnit(ASTContext& context) {
   // Don't run the plugin if the compilation unit is already invalid.
   if (reporter_.hasErrorOccurred())
     return;
 
   ParseFunctionTemplates(context.getTranslationUnitDecl());
 
   CollectVisitor visitor;
@@ skipping 631 matching lines @@
   SourceLocation spelling_location = source_manager.getSpellingLoc(loc);
   PresumedLoc ploc = source_manager.getPresumedLoc(spelling_location);
   if (ploc.isInvalid()) {
     // If we're in an invalid location, we're looking at things that aren't
     // actually stated in the source.
     return false;
   }
   *filename = ploc.getFilename();
   return true;
 }