Fixes for Blink roll.

tools/dom/scripts/idlparser.py

Index: tools/dom/scripts/idlparser.py
diff --git a/tools/dom/scripts/idlparser.py b/tools/dom/scripts/idlparser.py
index 7016f4d136a43a9c791aa99275166b5eee607018..01a19c2e0031bbaf5fccdde288ffb73031783635 100755
--- a/tools/dom/scripts/idlparser.py
+++ b/tools/dom/scripts/idlparser.py
@@ -70,7 +70,7 @@ class IDLParser(object):
         OR(Module, Interface, ExceptionDef, TypeDef, ImplStmt,
            ValueTypeDef, Const, Enum),
         # WebKit:
-        OR(Module, Interface, Enum, TypeDef))
+        OR(Module, Interface, Enum, TypeDef, ImplStmt, CallbackDeclaration))
 
     def Enum():
       def StringLiteral():
@@ -90,6 +90,9 @@ class IDLParser(object):
         [MAYBE(_Annotations), MAYBE(ExtAttrs), 'module', Id,
          '{', _Definitions, '}', MAYBE(';')])
 
+    def CallbackDeclaration():
+      return [Callback, Type, '=', Type,'(', ')', ';']
+
     def Callback():
       return ['callback']