Updating JSON Schema Compiler to add description field to schemas.

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 519ae56e5a8b819b99e06d347f9bc94c347e77aa..8197f31a41cac2a52457fd10331c146fcaad190f 100644
--- a/tools/json_schema_compiler/idl_schema.py
+++ b/tools/json_schema_compiler/idl_schema.py
@@ -309,7 +309,7 @@ class Namespace(object):
   dictionary that the JSON schema compiler expects to see.
   '''
 
-  def __init__(self, namespace_node, nodoc=False, internal=False):
+  def __init__(self, namespace_node, description, nodoc=False, internal=False):
     self.namespace = namespace_node
     self.nodoc = nodoc
     self.internal = internal
@@ -317,6 +317,7 @@ class Namespace(object):
     self.functions = []
     self.types = []
     self.callbacks = OrderedDict()
+    self.description = description
 
   def process(self):
     for node in self.namespace.children:
@@ -334,6 +335,7 @@ class Namespace(object):
       else:
         sys.exit('Did not process %s %s' % (node.cls, node))
     return {'namespace': self.namespace.GetName(),
+            'description': self.description,
             'nodoc': self.nodoc,
             'types': self.types,
             'functions': self.functions,
@@ -361,16 +363,20 @@ class IDLSchema(object):
     namespaces = []
     nodoc = False
     internal = False
+    description = None
     for node in self.idl:
       if node.cls == 'Namespace':
-        namespace = Namespace(node, nodoc, internal)
+        if not description:
+          raise ValueError('%s must have a namespace-level comment. This will '
+                           'appear on the API summary page.' % node.GetName())
+        namespace = Namespace(node, description, nodoc, internal)
         namespaces.append(namespace.process())
         nodoc = False
         internal = False
       elif node.cls == 'Copyright':
         continue
       elif node.cls == 'Comment':
-        continue
+        description = node.GetName()
       elif node.cls == 'ExtAttribute':
         if node.name == 'nodoc':
           nodoc = bool(node.value)