blink_gc_plugin: detect singletons with embedded ScriptWrappables.

tools/clang/blink_gc_plugin/DiagnosticsReporter.h

Index: tools/clang/blink_gc_plugin/DiagnosticsReporter.h
diff --git a/tools/clang/blink_gc_plugin/DiagnosticsReporter.h b/tools/clang/blink_gc_plugin/DiagnosticsReporter.h
index 6a32f70ec6fb72f8964cd865e5f322fc04ed8d7a..c30d07acab42469a0815df14432fb72f338acc6d 100644
--- a/tools/clang/blink_gc_plugin/DiagnosticsReporter.h
+++ b/tools/clang/blink_gc_plugin/DiagnosticsReporter.h
@@ -62,8 +62,9 @@ class DiagnosticsReporter {
                                      clang::CXXRecordDecl* base);
   void BaseClassMustDeclareVirtualTrace(RecordInfo* derived,
                                               clang::CXXRecordDecl* base);
-  void TraceMethodForStackAllocatedClass(RecordInfo* parent,
+  void TraceMethodForStackAllocatedClass(RecordInfo* info,
                                          clang::CXXMethodDecl* trace);
+  void StaticSingletonContainsScriptWrappable(clang::VarDecl* info);
 
   void NoteManualDispatchMethod(clang::CXXMethodDecl* dispatch);
   void NoteBaseRequiresTracing(BasePoint* base);
@@ -78,11 +79,14 @@ class DiagnosticsReporter {
   void NoteField(FieldPoint* point, unsigned note);
   void NoteField(clang::FieldDecl* field, unsigned note);
   void NoteOverriddenNonVirtualTrace(clang::CXXMethodDecl* overridden);
+  void NoteUnsafeScriptWrappableField(clang::VarDecl* decl,
+                                      const std::string& context,
+                                      const std::string& type);
 
  private:
-  clang::DiagnosticBuilder ReportDiagnostic(
-      clang::SourceLocation location,
-      unsigned diag_id);
+  clang::DiagnosticBuilder ReportDiagnostic(unsigned diag_id);
+  clang::DiagnosticBuilder ReportDiagnostic(clang::SourceLocation location,
+                                            unsigned diag_id);
 
   void ReportMissingDispatchMethod(RecordInfo* info, unsigned error);
   void ReportMissingDispatch(const clang::FunctionDecl* dispatch,
@@ -114,6 +118,9 @@ class DiagnosticsReporter {
   unsigned diag_class_declares_pure_virtual_trace_;
   unsigned diag_left_most_base_must_be_polymorphic_;
   unsigned diag_base_class_must_declare_virtual_trace_;
+  unsigned diag_iterator_to_gc_managed_collection_;
+  unsigned diag_trace_method_of_stack_allocated_parent_;
+  unsigned diag_static_singleton_with_scriptwrappable_;
 
   unsigned diag_base_requires_tracing_note_;
   unsigned diag_field_requires_tracing_note_;
@@ -137,8 +144,7 @@ class DiagnosticsReporter {
   unsigned diag_field_requires_finalization_note_;
   unsigned diag_overridden_non_virtual_trace_note_;
   unsigned diag_manual_dispatch_method_note_;
-  unsigned diag_iterator_to_gc_managed_collection_note_;
-  unsigned diag_trace_method_of_stack_allocated_parent_;
+  unsigned diag_unsafe_scriptwrappable_field_note_;
 };
 
 #endif // TOOLS_BLINK_GC_PLUGIN_DIAGNOSTICS_REPORTER_H_