Add webgl constants back to correct class

tools/dom/scripts/htmldartgenerator.py

 #!/usr/bin/python
 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 """This module provides shared functionality for the system to generate
 dart:html APIs from the IDL database."""
 
 import emitter
 from generator import AnalyzeOperation, ConstantOutputOrder, \
@@ skipping 89 matching lines @@
 
     # Generate operations.
     for id in sorted(operationsByName.keys()):
       operations = operationsByName[id]
       info = AnalyzeOperation(interface, operations)
       self.AddOperation(info, declare_only)
       if ('%s.%s' % (interface.id, info.declared_name) in
           convert_to_future_members):
         self.AddOperation(ConvertToFuture(info), declare_only)
 
+  def _HoistableConstants(self, interface):
+    consts = []
+    if interface.parents:
+      for parent in interface.parents:
+        parent_interface = self._database.GetInterface(parent.type.id)
+        # TODO(vsm): This should be a general check.  E.g., on private
+        # interfaces?
+        if parent.type.id == 'WebGLRenderingContextBase':
+          consts = consts + parent_interface.constants
+    return consts
+
   def AddSecondaryMembers(self, interface):
     # With multiple inheritance, attributes and operations of non-first
     # interfaces need to be added.  Sometimes the attribute or operation is
     # defined in the current interface as well as a parent.  In that case we
     # avoid making a duplicate definition and pray that the signatures match.
+    if not self._renamer.ShouldSuppressInterface(interface):
+      secondary_constants = sorted(self._HoistableConstants(interface),
+                                     ConstantOutputOrder)
+      for const in secondary_constants:
+        self.AddConstant(const)
+
     secondary_parents = self._database.TransitiveSecondaryParents(interface,
                           not self._dart_use_blink)
     for parent_interface in sorted(secondary_parents):
       if isinstance(parent_interface, str):
         continue
       for attr in sorted(parent_interface.attributes, ConstantOutputOrder):
         if not FindMatchingAttribute(interface, attr):
           if attr.type.id != 'EventHandler':
             self.SecondaryContext(parent_interface)
             self.AddAttribute(attr)
@@ skipping 636 matching lines @@
     return self._type_registry.TypeInfo(type_name).narrow_dart_type()
 
   def _NarrowInputType(self, type_name):
     return self._NarrowToImplementationType(type_name)
 
   def _DartType(self, type_name):
     return self._type_registry.DartType(type_name)
 
   def _TypeInfo(self, type_name):
     return self._type_registry.TypeInfo(type_name)