extensions: tabs: set tab id to -1 for app/devtools windows

chrome/common/extensions/api/tabs.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": "tabs",
     "description": "Use the <code>chrome.tabs</code> API to interact with the browser's tab system. You can use this API to create, modify, and rearrange tabs in the browser.",
     "types": [
       {
         "id": "Tab",
         "type": "object",
         "properties": {
-          "id": {"type": "integer", "minimum": 0, "optional": true, "description": "The ID of the tab. Tab IDs are unique within a browser session. Under some circumstances a Tab may not be assigned an ID, for example when querying foreign tabs using the $(ref:sessions) API, in which case a session ID may be present."},
+          "id": {"type": "integer", "minimum": -1, "optional": true, "description": "The ID of the tab. Tab IDs are unique within a browser session. Under some circumstances a Tab may not be assigned an ID, for example when querying foreign tabs using the $(ref:sessions) API, in which case a session ID may be present. Tab ID can also be set to chrome.tabs.TAB_ID_NONE for apps and devtools windows."},
           // TODO(kalman): Investigate how this is ending up as -1 (based on window type? a bug?) and whether it should be optional instead.
           "index": {"type": "integer", "minimum": -1, "description": "The zero-based index of the tab within its window."},
           "windowId": {"type": "integer", "minimum": 0, "description": "The ID of the window the tab is contained within."},
           "openerTabId": {"type": "integer", "minimum": 0, "optional": true, "description": "The ID of the tab that opened this tab, if any. This property is only present if the opener tab still exists."},
           "selected": {"type": "boolean", "description": "Whether the tab is selected.", "deprecated": "Please use $(ref:tabs.Tab.highlighted)."},
           "highlighted": {"type": "boolean", "description": "Whether the tab is highlighted."},
           "active": {"type": "boolean", "description": "Whether the tab is active in its window. (Does not necessarily mean the window is focused.)"},
           "pinned": {"type": "boolean", "description": "Whether the tab is pinned."},
           "audible": {"type": "boolean", "optional": true, "description": "Whether the tab has produced sound over the past couple of seconds (but it might not be heard if also muted). Equivalent to whether the speaker audio indicator is showing."},
           "muted": {"type": "boolean", "optional": true, "description": "Whether the tab is prevented from playing sound (but hasn't necessarily recently produced sound). Equivalent to whether the muted audio indicator is showing."},
@@ skipping 70 matching lines @@
         "enum": ["loading", "complete"],
         "description": "Whether the tabs have completed loading."
       },
       {
         "id": "WindowType",
         "type": "string",
         "enum": ["normal", "popup", "panel", "app", "devtools"],
         "description": "The type of window."
       }
     ],
+    "properties": {
+      "TAB_ID_NONE": {
+        "value": -1,
+        "description": "An ID which represents the absence of a browser tab."
+      }
+    },
     "functions": [
       {
         "name": "get",
         "type": "function",
         "description": "Retrieves details about the specified tab.",
         "parameters": [
           {
             "type": "integer",
             "name": "tabId",
             "minimum": 0
@@ skipping 1027 matching lines @@
             "tabId": {"type": "integer", "minimum": 0},
             "oldZoomFactor": {"type": "number"},
             "newZoomFactor": {"type": "number"},
             "zoomSettings": {"$ref": "ZoomSettings"}
           }
         }]
       }
     ]
   }
 ]