Add RuntimeEnabled info to InterfaceInfo.pickle.

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..d8200b99418c88964845e5a4e8e0b8d421f6810f 100755
--- a/Source/bindings/scripts/compute_interfaces_info.py
+++ b/Source/bindings/scripts/compute_interfaces_info.py
@@ -161,6 +161,7 @@ def compute_individual_info(idl_filename):
 
     extended_attributes = get_interface_extended_attributes_from_idl(idl_file_contents)
     implemented_as = extended_attributes.get('ImplementedAs')
+    runtime_enabled = extended_attributes.get('RuntimeEnabled')
     # FIXME: remove [NoHeader] once switch to Python
     this_include_path = (include_path(idl_filename, implemented_as)
                          if 'NoHeader' not in extended_attributes else None)
@@ -187,6 +188,7 @@ def compute_individual_info(idl_filename):
         # These cause rebuilds of referrers, due to the dependency, so these
         # should be minimized; currently only targets of [PutForwards].
         'referenced_interfaces': get_put_forward_interfaces_from_idl(idl_file_contents),
+        'runtime_enabled': runtime_enabled,
     }
 
     # Record inheritance information