Add support for matching query parameters in URLMatcher

chrome/common/extensions/api/events.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": "events",
     "description": "The <code>chrome.events</code> namespace contains common types used by APIs dispatching events to notify you when something interesting happens.",
     "compiler_options": {
       "implemented_in": "chrome/browser/extensions/api/declarative/declarative_api.h"
@@ skipping 244 matching lines @@
             "description": "Matches if the path segment of the URL starts with a specified string.",
             "optional": true
           },
           "pathSuffix": {
             "type": "string",
             "description": "Matches if the path segment of the URL ends with a specified string.",
             "optional": true
           },
           "queryContains": {
             "type": "string",
-            "description": "Matches if the query segment of the URL contains a specified string.",
+            "description": "Matches if the query segment of the URL contains a specified set of key value pairs with '&' as the delimiter. Query starting with a partial key or value is not supported, i.e., the string should start with a full key optionally followed by an equal sign and a value.",

[battre, 2014/04/01 14:46:07]

s/Query starting/A queryContains filter starting/

             "optional": true
           },
           "queryEquals": {
             "type": "string",
             "description": "Matches if the query segment of the URL is equal to a specified string.",
             "optional": true
           },
           "queryPrefix": {
             "type": "string",
             "description": "Matches if the query segment of the URL starts with a specified string.",
@@ skipping 50 matching lines @@
                 {"type": "array", "items": {"type": "integer"}, "description": "A pair of integers identiying the start and end (both inclusive) of a port range."}
               ]
             }
           }
         }
       }
     ]
   }
 ]