Updating JSON Schema Compiler to add description field to schemas.

chrome/common/extensions/api/metrics_private.json

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 [
   {
     "namespace": "metricsPrivate",
-    "nodoc": true,
+    "description": "none",
     "types": [
       {
         "id": "MetricType",
         "type":  "object",
         "description": "Describes the type of metric that is to be collected.",
         "properties": {
           "metricName": {"type": "string", "description": "A unique name within the extension for the metric."},
           "type": {
             "type": "string",
             "enum": ["histogram-log", "histogram-linear"],
@@ skipping 98 matching lines @@
         "description": "Adds a value to the given metric.",
         "parameters": [
           {"name": "metric", "$ref": "MetricType"},
           {"name": "value", "type": "integer"}
         ]
       }
     ],
     "events": []
   }
 ]