Pass the render process id to the FrameNavigationState.

chrome/common/extensions/api/web_navigation.json

Index: chrome/common/extensions/api/web_navigation.json
diff --git a/chrome/common/extensions/api/web_navigation.json b/chrome/common/extensions/api/web_navigation.json
index 856859c858264a14097b3a1fa0b82099cb6edae2..de0a45838c55fbf49e82e845a762b9da58a1bdc8 100644
--- a/chrome/common/extensions/api/web_navigation.json
+++ b/chrome/common/extensions/api/web_navigation.json
@@ -18,6 +18,7 @@
             "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." }
             }
           },
@@ -70,6 +71,10 @@
                       "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."