Give generatored bindings classes a field remembering an index into a cache of handles on the corre…

tools/dom/scripts/dartdomgenerator.py

Index: tools/dom/scripts/dartdomgenerator.py
diff --git a/tools/dom/scripts/dartdomgenerator.py b/tools/dom/scripts/dartdomgenerator.py
index 2ba67aae96c2ad0d01f020326e7a7bec9358f9d5..787af487d1cfbdf7da559e3c58cfdf36d4f576ed 100755
--- a/tools/dom/scripts/dartdomgenerator.py
+++ b/tools/dom/scripts/dartdomgenerator.py
@@ -138,6 +138,36 @@ def GenerateFromDatabase(common_database, dart2js_output_dir,
     cpp_library_emitter.EmitResolver(
         template_loader.Load('cpp_resolver.template'), dartium_output_dir)
 
+    path = os.path.join(cpp_output_dir, 'DartWebkitClassIds.h')
+    e = emitters.FileEmitter(path)
+    e.Emit("""
+// WARNING: Do not edit - generated code.
+// See dart/tools/dom/scripts/dartdomgenerator.py
+
+#ifndef DartWebkitClassIds_h
+#define DartWebkitClassIds_h
+
+namespace WebCore {
+
+enum {
+    _HistoryCrossFrameClassId = 0,
+    _LocationCrossFrameClassId,
+    _DOMWindowCrossFrameClassId,
+    _NPObjectClassId,
+    // New types that are not auto-generated should be added here.
+""")
+    for interface in webkit_database.GetInterfaces():
+      interface_name = interface.id
+      e.Emit('    %sClassId,\n' % interface_name)
+    e.Emit("""
+    NumWebkitClassIds
+};
+
+} // namespace WebCore
+
+#endif // DartWebkitClassIds_h
+""")
+
   _logger.info('Flush...')
   emitters.Flush()