Removing overloaded operations in dart2js.

tools/dom/scripts/htmldartgenerator.py

Index: tools/dom/scripts/htmldartgenerator.py
diff --git a/tools/dom/scripts/htmldartgenerator.py b/tools/dom/scripts/htmldartgenerator.py
index 52d1de8e3ab088443839ffe0af5c66cfcc22efc5..0692740560c880650d35bf940e03e0b15b3288dd 100644
--- a/tools/dom/scripts/htmldartgenerator.py
+++ b/tools/dom/scripts/htmldartgenerator.py
@@ -93,6 +93,9 @@ class HtmlDartGenerator(object):
     # Group overloaded operations by name.
     self._AddRenamedOverloads(interface)
     operationsByName = self._OperationsByName(interface)
+    if self.OmitOperationOverrides():
+      self._RemoveShadowingOperationsWithSameSignature(operationsByName,
+          interface)
 
     # Generate operations.
     for id in sorted(operationsByName.keys()):
@@ -121,6 +124,10 @@ class HtmlDartGenerator(object):
       # Group overloaded operations by name.
       operationsByName =self._OperationsByName(parent_interface)
 
+      if self.OmitOperationOverrides():
+        self._RemoveShadowingOperationsWithSameSignature(operationsByName,
+            interface)
+
       # Generate operations.
       for id in sorted(operationsByName.keys()):
         if not any(op.id == id for op in interface.operations):
@@ -129,6 +136,21 @@ class HtmlDartGenerator(object):
           self.SecondaryContext(parent_interface)
           self.AddOperation(info)
 
+  def _RemoveShadowingOperationsWithSameSignature(self, operationsByName,
+      interface):
+    if not interface.parents:
+      return
+
+    parent = self._database.GetInterface(interface.parents[0].type.id)
+    if parent == self._interface or parent == interface:
+      return
+    for operation in parent.operations:
+      if operation.id in operationsByName:
+        operations = operationsByName[operation.id]
+        for existing_operation in operations:
+          if existing_operation.SameSignatureAs(operation):
+            del operationsByName[operation.id]
+
   def _AddRenamedOverloads(self, interface):
     """The IDL has a number of functions with the same name but that accept
     different types. This is fine for JavaScript, but results in vague type
@@ -201,6 +223,9 @@ class HtmlDartGenerator(object):
       operationsByName.setdefault(name, []).append(operation)
     return operationsByName
 
+  def OmitOperationOverrides(self):
+    return False
+
   def AddConstant(self, constant):
     const_name = self._renamer.RenameMember(
         self._interface.id, constant, constant.id, 'get:', dartify_name=False)