Add back [ImplementedInBaseClass] IDL extended attribute

Source/bindings/scripts/compute_interfaces_info.py

Index: Source/bindings/scripts/compute_interfaces_info.py
diff --git a/Source/bindings/scripts/compute_interfaces_info.py b/Source/bindings/scripts/compute_interfaces_info.py
index 8d425bf0bc7fdc4e4dde2fcb3e02edeae79d90ec..5084d903111502a87044c4d88fa1f4b016d981dd 100755
--- a/Source/bindings/scripts/compute_interfaces_info.py
+++ b/Source/bindings/scripts/compute_interfaces_info.py
@@ -163,7 +163,9 @@ def compute_individual_info(idl_filename):
     implemented_as = extended_attributes.get('ImplementedAs')
     # FIXME: remove [NoHeader] once switch to Python
     this_include_path = (include_path(idl_filename, implemented_as)
-                         if 'NoHeader' not in extended_attributes else None)
+                         if ('ImplementedInBaseClass' not in extended_attributes
+                             and 'NoHeader' not in extended_attributes)

[haraken, 2014/03/24 05:51:32]

Can you remove NoHeader in the near future?

[Nils Barth (inactive), 2014/03/24 06:19:45]

Yes; will do in separate CL to keep this one simple.

Remove [NoHeader] interface extended attribute
https://codereview.chromium.org/208393014/

+                         else None)
 
     # Handle partial interfaces
     partial_interface_name = get_partial_interface_name_from_idl(idl_file_contents)