Blink GC plugin: TODO/OWNERS update.

tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp

Index: tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
diff --git a/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp b/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
index 4830a454d59a769d17b9bb3804c57d8835e3012f..8658b04304f32cba63509a9a7fd97df2ba63f1d3 100644
--- a/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
+++ b/tools/clang/blink_gc_plugin/BlinkGCPlugin.cpp
@@ -957,6 +957,7 @@ class BlinkGCPluginConsumer : public ASTConsumer {
 
     // Check polymorphic classes that are GC-derived or have a trace method.
     if (info->record()->hasDefinition() && info->record()->isPolymorphic()) {
+      // TODO: Check classes that inherit a trace method.
       CXXMethodDecl* trace = info->GetTraceMethod();
       if (trace || info->IsGCDerived())
         CheckPolymorphicClass(info, trace);