blink_gc_plugin: detect singletons with embedded ScriptWrappables.

tools/clang/blink_gc_plugin/BlinkGCPluginConsumer.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_CONSUMER_H_
 #define TOOLS_BLINK_GC_PLUGIN_BLINK_GC_PLUGIN_CONSUMER_H_
 
 #include <string>
 
 #include "BlinkGCPluginOptions.h"
@@ skipping 48 matching lines @@
 
   // Determine what type of tracing method this is (dispatch or trace).
   void CheckTraceOrDispatchMethod(RecordInfo* parent,
                                   clang::CXXMethodDecl* method);
 
   // Check an actual trace method.
   void CheckTraceMethod(RecordInfo* parent,
                         clang::CXXMethodDecl* trace,
                         Config::TraceMethodType trace_type);
 
+  void CheckStaticSingleton(clang::VarDecl*);
+
   void DumpClass(RecordInfo* info);
 
   // Adds either a warning or error, based on the current handling of -Werror.
   clang::DiagnosticsEngine::Level getErrorLevel();
 
   std::string GetLocString(clang::SourceLocation loc);
 
   bool IsIgnored(RecordInfo* info);
 
   bool IsIgnoredClass(RecordInfo* info);
 
   bool InIgnoredDirectory(RecordInfo* info);
 
   bool InCheckedNamespace(RecordInfo* info);
 
   bool GetFilename(clang::SourceLocation loc, std::string* filename);
 
   clang::CompilerInstance& instance_;
   DiagnosticsReporter reporter_;
   BlinkGCPluginOptions options_;
   RecordCache cache_;
   JsonWriter* json_;
 };
 
 #endif  // TOOLS_BLINK_GC_PLUGIN_BLINK_GC_PLUGIN_CONSUMER_H_