Pass the render process id to the FrameNavigationState.

chrome/common/extensions/api/web_navigation.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": "webNavigation",
     "types": [],
     "functions": [
       {
         "name": "getFrame",
         "type": "function",
         "description": "Retrieves information about the given frame. A frame refers to an <iframe> or a <frame> of a web page and is identified by a tab ID and a frame ID.",
         "parameters": [
           {
             "type": "object",
             "name": "details",
             "description": "Information about the frame to retrieve information about.",
             "properties": {
               "tabId": { "type": "integer", "minimum": 0, "description": "The ID of the tab in which the frame is." },
+              "processId": {"type": "integer", "description": "The ID of the process runs the renderer for this tab."},
               "frameId": { "type": "integer", "minimum": 0, "description": "The ID of the frame in the given tab." }
             }
           },
           {
             "type": "function", "name": "callback", "parameters": [
               {
                 "type": "object",
                 "name": "details",
                 "optional": true,
                 "description": "Information about the requested frame, null if the specified frame ID and/or tab ID are invalid.",
@@ skipping 32 matching lines @@
                 "type": "array",
                 "description": "A list of frames in the given tab, null if the specified tab ID is invalid.",
                 "optional": true,
                 "items": {
                   "type": "object",
                   "properties": {
                     "errorOccurred": {
                       "type": "boolean",
                       "description": "True if the last navigation in this frame was interrupted by an error, i.e. the onErrorOccurred event fired."
                     },
+                    "processId": {
+                      "type": "integer",
+                      "description": "The ID of the process runs the renderer for this tab."
+                    },
                     "frameId": {
                       "type": "integer",
                       "description": "The ID of the frame. 0 indicates that this is the main frame; a positive value indicates the ID of a subframe."
                     },
                     "url": {
                       "type": "string",
                       "description": "The URL currently associated with this frame, if the frame identified by the frameId existed at one point in the given tab. The fact that an URL is associated with a given frameId does not imply that the corresponding frame still exists."
                     }
                   }
                 }
@@ skipping 213 matching lines @@
               "transitionType": {"type": "string", "enum": ["link", "typed", "auto_bookmark", "auto_subframe", "manual_subframe", "generated", "start_page", "form_submit", "reload", "keyword", "keyword_generated"], "description": "Cause of the navigation. The same transition types as defined in the history API are used."},
               "transitionQualifiers": {"type": "array", "description": "A list of transition qualifiers.", "items": {"type": "string", "enum": ["client_redirect", "server_redirect", "forward_back", "from_address_bar"]}},
               "timeStamp": {"type": "number", "description": "The time when the navigation was committed, in milliseconds since the epoch."}
             }
           }
         ]
       }
     ]
   }
 ]