Add support for 'nocompile' to IDL schema compiler.

tools/json_schema_compiler/idl_schema.py

Index: tools/json_schema_compiler/idl_schema.py
diff --git a/tools/json_schema_compiler/idl_schema.py b/tools/json_schema_compiler/idl_schema.py
index 8e46d1218a26bd6339fbcb5b1dbd0ad2ee5bb759..d65746a210af0d24649677719f8291107a474fa6 100644
--- a/tools/json_schema_compiler/idl_schema.py
+++ b/tools/json_schema_compiler/idl_schema.py
@@ -131,10 +131,9 @@ class Member(object):
   def process(self, callbacks):
     properties = {}
     name = self.node.GetName()
-    if self.node.GetProperty('OPTIONAL'):
-      properties['optional'] = True
-    if self.node.GetProperty('nodoc'):
-      properties['nodoc'] = True
+    for property_name in ('OPTIONAL', 'nodoc', 'nocompile'):
+      if self.node.GetProperty(property_name):
+        properties[property_name.lower()] = True
     is_function = False
     parameter_comments = {}
     for node in self.node.children: