Bindings layer for declarative events API

chrome/common/extensions/api/webRequest.json

 [
   {
     "namespace": "webRequest",
     "types": [
       {
         "id": "RequestFilter",
         "type": "object",
         "description": "An object describing filters to apply to webRequest events.",
         "properties": {
           "urls": {
@@ skipping 57 matching lines @@
           "authCredentials": {
             "type": "object",
             "description": "Only used as a response to the onAuthRequired event. If set, the request is made using the supplied credentials.",
             "optional": true,
             "properties": {
               "username": {"type": "string"},
               "password": {"type": "string"}
             }
           }
         }
+      },
+      {
+        "nodoc": true,
+        "id": "RequestMatcher",
+        "type": "object",
+        "description": "Matches network events by various criteria. Experimental junk, do not use!",
+        "properties": {
+          "url": {
+            "type": "string",
+            "description": "Matches for a full URL",
+            "optional": true
+          },
+          "filterType": { "type": "string", "enum": ["net.RequestMatcher"] }
+        }
+      },
+      {
+        "nodoc": true,
+        "id": "CancelRequest",
+        "description": "Declarative event action that cancels a network request. Experimental junk, do not use!",
+        "type": "object",
+        "properties": {
+          "actionType": { "type": "string", "enum": ["net.CancelRequest"] }
+        }
+      },
+      {
+        "nodoc": true,
+        "id": "ModifyRequest",
+        "description": "Declarative event action that modifies a network request. Experimental junk, do not use!",
+        "type": "object",
+        "properties": {
+          "actionType": { "type": "string", "enum": ["net.ModifyRequest"] }
+        }
       }
     ],
     "functions": [
       {
         "name": "addEventListener",
         "nodoc": true,
         "type": "function",
         "description": "Used internally to implement the special form of addListener for the webRequest events.",
         "parameters": [
           {"type": "function", "name": "callback"},
@@ skipping 423 matching lines @@
             }
           }
         ],
         "extraParameters": [
           {
             "$ref": "RequestFilter",
             "name": "filter",
             "description": "A set of filters that restricts the events that will be sent to this listener."
           }
         ]
+      },
+      {
+        "name": "onRequest",
+        "nodoc": true,
+        "options": {
+          "supportsListeners": false,
+          "supportsRules": true,
+          "conditions": ["RequestMatcher"],
+          "actions": ["CancelRequest", "ModifyRequest"]
+        }
       }
     ]
   }
 ]