Add multi-level undo/redo functions to Bookmark Manager Private API.

chrome/common/extensions/api/bookmark_manager_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": "bookmarkManagerPrivate",
     "description": "none",
     "nodoc": true,
     "types": [
@@ skipping 284 matching lines @@
             "description": "The meta info to set",
             "type": "string"
           },
           {
             "name": "callback",
             "type": "function",
             "optional": true,
             "parameters": []
           }
         ]
+      },
+      {
+        "name": "undo",
+        "type": "function",
+        "description": "Performs an undo of the last change to the bookmark model",
+        "nodoc": "true",
+        "parameters": []
+      },
+      {
+        "name": "redo",
+        "type": "function",
+        "description": "Performs a redo of last undone change to the bookmark model",
+        "nodoc": "true",
+        "parameters": []
+      },
+      {
+        "name": "getUndoInfo",
+        "type": "function",
+        "description": "Gets the information for the undo if available",
+        "nodoc": "true",
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "parameters": [
+              {
+                "name": "result",
+                "type": "object",
+                "properties": {
+                  "enabled" : {"type": "boolean", "description": "Whether there is an action to undo"},
+                  "label" : {"type": "string", "description": "The i18n label to use for the undo action"}
+                                }
+              }
+            ]
+          }
+        ]
+      },
+      {
+        "name": "getRedoInfo",
+        "type": "function",
+        "description": "Gets the information for the redo if available",
+        "nodoc": "true",
+        "parameters": [
+          {
+            "type": "function",
+            "name": "callback",
+            "parameters": [
+              {
+                "name": "result",
+                "type": "object",
+                "properties": {
+                  "enabled" : {"type": "boolean", "description": "Whether there is an action to redo"},
+                  "label" : {"type": "string", "description": "The i18n label to use for the redo action"}
+                                }
+              }
+            ]
+          }
+        ]
       }
     ],
     "events": [
       {
         "name": "onDragEnter",
         "type": "function",
         "description": "Fired when dragging bookmarks over the document",
         "parameters": [
           {"name": "bookmarkNodeData", "$ref": "BookmarkNodeData"}
         ]
@@ skipping 10 matching lines @@
         "name": "onDrop",
         "type": "function",
         "description": "Fired when the user drops bookmarks on the document",
         "parameters": [
           {"name": "bookmarkNodeData", "$ref": "BookmarkNodeData"}
         ]
       }
     ]
   }
 ]