[bindings] partial interfaces should not violate componentization

Source/bindings/scripts/idl_definitions.py

Index: Source/bindings/scripts/idl_definitions.py
diff --git a/Source/bindings/scripts/idl_definitions.py b/Source/bindings/scripts/idl_definitions.py
index ee7158ab663cde7578524829e76c38e02088f376..5664c3848c9ce973c51c4fd793e448314c9567ad 100644
--- a/Source/bindings/scripts/idl_definitions.py
+++ b/Source/bindings/scripts/idl_definitions.py
@@ -275,6 +275,8 @@ class IdlInterface(object):
         self.operations = []
         self.parent = None
         self.stringifier = None
+        self.original_interface = None

[haraken, 2014/10/09 04:24:00]

Is "original interface" a term of Web IDL? I'm not sure of the best name.
original interface, base interface, dependent_interface, etc.

I'm fine with "original interface" if Web IDL doesn't have a speced term.

[tasak, 2014/10/10 07:52:22]

I could not find any special term in WebIDL spec. However, I found:

Note
A partial interface definition cannot specify that the interface inherits from
another interface. Inheritance must be specified on the original interface 
definition.

or

4.3.5 Exposed
...
- partial interface
  The exposure set of the partial interface is the exposure set of the original
interface definition.

http://heycam.github.io/webidl/

So I think, we can use "original".

+        self.partial_interfaces = []
         if not node:  # Early exit for IdlException.__init__
             return