Bug 764456 part 1. Flag consequential interfaces in the WebIDL data model. r=khuey

dom/bindings/Codegen.py

@@ -1564,11 +1564,11 @@ for (uint32_t i = 0; i < length; ++i) {
         elif descriptor.workers:
             templateBody += "${declName} = &${val}.toObject();"
         else:
-            # External interface.  We always have a holder for these,
-            # because we don't actually know whether we have to addref
-            # when unwrapping or not.  So we just pass an
-            # getter_AddRefs(nsRefPtr) to XPConnect and if we'll need
-            # a release it'll put a non-null pointer in there.
+            # Either external, or new-binding non-castable.  We always have a
+            # holder for these, because we don't actually know whether we have
+            # to addref when unwrapping or not.  So we just pass an
+            # getter_AddRefs(nsRefPtr) to XPConnect and if we'll need a release
+            # it'll put a non-null pointer in there.
             if forceOwningType:
                 # Don't return a holderType in this case; our declName
                 # will just own stuff.

dom/bindings/parser/WebIDL.py

@@ -351,6 +351,9 @@ class IDLExternalInterface(IDLObjectWithIdentifier):
     def isInterface(self):
         return True
 
+    def isConsequential(self):
+        return False
+
     def addExtendedAttributes(self, attrs):
         assert len(attrs) == 0
 
@@ -368,6 +371,7 @@ class IDLInterface(IDLObjectWithScope):
         self._finished = False
         self.members = list(members) # clone the list
         self.implementedInterfaces = set()
+        self._consequential = False
 
         IDLObjectWithScope.__init__(self, location, parentScope, name)
 
@@ -459,6 +463,8 @@ class IDLInterface(IDLObjectWithScope):
         for iface in sorted(self.getConsequentialInterfaces(),
                             cmp=cmp,
                             key=lambda x: x.identifier.name):
+            # Flag the interface as being someone's consequential interface
+            iface.setConsequential()
             additionalMembers = iface.originalMembers;
             for additionalMember in additionalMembers:
                 for member in self.members:
@@ -507,6 +513,12 @@ class IDLInterface(IDLObjectWithScope):
     def isExternal(self):
         return False
 
+    def setConsequential(self):
+        self._consequential = True
+
+    def isConsequential(self):
+        return self._consequential
+
     def setCallback(self, value):
         self._callback = value