Implemented declarative redirects to transparent image and empty document.

chrome/common/extensions/api/declarative_web_request.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": "declarativeWebRequest",
     "documentation_permissions_required": ["declarative", "declarativeWebRequest"],
     "types": [
       {
@@ skipping 33 matching lines @@
         "id": "declarativeWebRequest.RedirectRequest",
         "description": "Declarative event action that redirects a network request.",
         "type": "object",
         "properties": {
           "instanceType": {
             "type": "string", "enum": ["declarativeWebRequest.RedirectRequest"],
             "nodoc": true
           },
           "redirectUrl": { "type": "string", "description": "Destination to where the request is redirected."}
         }
+      },
+      {
+        "id": "declarativeWebRequest.RedirectToTransparentImage",
+        "description": "Declarative event action that redirects a network request to a transparent image.",
+        "type": "object",
+        "properties": {
+          "instanceType": {
+            "type": "string", "enum": ["declarativeWebRequest.RedirectToTransparentImage"],
+            "nodoc": true
+          }
+        }
+      },
+      {
+        "id": "declarativeWebRequest.RedirectToEmptyDocument",
+        "description": "Declarative event action that redirects a network request to an empty document.",
+        "type": "object",
+        "properties": {
+          "instanceType": {
+            "type": "string", "enum": ["declarativeWebRequest.RedirectToEmptyDocument"],
+            "nodoc": true
+          }
+        }
       }
     ],
     "functions": [
     ],
     "events": [
       {
         "name": "onRequest",
         "options": {
           "supportsListeners": false,
           "supportsRules": true,
           "conditions": ["declarativeWebRequest.RequestMatcher"],
           "actions": [
             "declarativeWebRequest.CancelRequest",
-            "declarativeWebRequest.RedirectRequest"
+            "declarativeWebRequest.RedirectRequest",
+            "declarativeWebRequest.RedirectToTransparentImage",
+            "declarativeWebRequest.RedirectToEmptyDocument"
           ]
         }
       }
     ]
   }
 ]