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..97fe12d2eb8618fd1a7d396440671395f38111d9 100755
--- a/tools/dom/scripts/dartdomgenerator.py
+++ b/tools/dom/scripts/dartdomgenerator.py
@@ -138,6 +138,34 @@ 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, 'DartClassIds.h')

[siva, 2013/09/12 18:18:20]

Can we call this file DartWebkitClassIds.h instead of DartClassIds.h to make
that more explicit.

+    e = emitters.FileEmitter(path)
+    e.Emit("""
+// WARNING: Do not edit - generated code.
+
+#ifndef DartClassIds_h
+#define DartClassIds_h

[siva, 2013/09/12 18:18:20]

DartWebkitClassIds_h

+
+namespace WebCore {
+
+enum {
+    _HistoryCrossFrameClassId = 0,
+    _LocationCrossFrameClassId,
+    _DOMWindowCrossFrameClassId,
+    _NPObjectClassId,

[siva, 2013/09/12 18:18:20]

We should add a comment here that whenever new types are introduced which are
not in the auto generated list they need to be added here too.

+""")
+    for interface in webkit_database.GetInterfaces():
+      interface_name = interface.id
+      e.Emit('    %sClassId,\n' % interface_name)
+    e.Emit("""
+    NumClassIds

[siva, 2013/09/12 18:18:20]

kNumWebKitClassIds maybe for this maybe.

+};
+
+} // namespace WebCore
+
+#endif // DartClassIds_h

[siva, 2013/09/12 18:18:20]

Ditto comment

+""")
+
   _logger.info('Flush...')
   emitters.Flush()