Add ability to limit when context menu items appear with url patterns....

chrome/common/extensions/api/extension_api.json

 [
   {
     "namespace": "extension",
     "unprivileged": true,
     "types": [
       {
         "id": "MessageSender",
         "type": "object",
         "description": "An object containing information about the script context that sent a message or request.",
         "properties": {
@@ skipping 2531 matching lines @@
               },
               "onclick": {
                 "type": "function",
                 "optional": true,
                 "description": "Function to be called back when your menu item is clicked."
               },
               "parentId": {
                 "type": "integer",
                 "optional": true,
                 "description": "The id of a parent menu item - this makes the item a child of a previously added item."
+              },
+              "documentUrlPatterns": {
+                "type": "array",
+                "items": {"type": "string"},
+                "optional": true,
+                "description": "Lets you restrict the item to only apply to documents whose URL matches one of the given patterns. (This applies to frames as well). For details on the format of a pattern, see <a href='match_patterns.html'>Match Patterns</a>."
+              },
+              "targetUrlPatterns": {
+                "type": "array",
+                "items": {"type": "string"},
+                "optional": true,
+                "description": "Similar to documentUrlPatterns, but this lets you filter based on the src attribute of img/audio/video tags and the href of anchor tags."
               }
             }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "description": "Called when the item has been created in the browser. If there were any problems creating the item, details will be avilable in chrome.extension.lastError.",
             "parameters": []
           }
@@ skipping 33 matching lines @@
                 "optional": true
               },
               "onclick": {
                 "type": "function",
                 "optional": true
               },
               "parentId": {
                 "type": "integer",
                 "optional": true,
                 "description": "Note: you cannot change an item to be a child of one of it's own descendants."
+              },
+              "documentUrlPatterns": {
+                "type": "array",
+                "items": {"type": "string"},
+                "optional": true
+              },
+              "targetUrlPatterns": {
+                "type": "array",
+                "items": {"type": "string"},
+                "optional": true
               }
             }
           },
           {
             "type": "function",
             "name": "callback",
             "optional": true,
             "parameters": [],
             "description": "Called when the context menu has been updated."
           }
@@ skipping 574 matching lines @@
       {
         "name": "onInputCancelled",
         "perExtensionEvent": true,
         "type": "function",
         "description": "User has ended the keyword input session without accepting the input.",
         "parameters": []
       }
     ]
   }
 ]