Add frameId to chrome.tabs.executeScript/insertCSS

extensions/browser/extension_api_frame_id_map.h

 // Copyright 2015 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.
 
 #ifndef EXTENSIONS_BROWSER_EXTENSION_API_FRAME_ID_MAP_H_
 #define EXTENSIONS_BROWSER_EXTENSION_API_FRAME_ID_MAP_H_
 
 #include <list>
 #include <map>
 
@@ skipping 30 matching lines @@
 // TODO(robwu): Keep an eye on crbug.com/524228 and act upon the outcome.
 class ExtensionApiFrameIdMap {
  public:
   using FrameIdCallback =
       base::Callback<void(int extension_api_frame_id,
                           int extension_api_parent_frame_id)>;
 
   // An invalid extension API frame ID.
   static const int kInvalidFrameId;
 
+  // Extension API frame ID of the top-level frame.
+  static const int kTopFrameId;
+
   static ExtensionApiFrameIdMap* Get();
 
   // Get the extension API frame ID for |rfh|.
   static int GetFrameId(content::RenderFrameHost* rfh);
 
   // Get the extension API frame ID for the parent of |rfh|.
   static int GetParentFrameId(content::RenderFrameHost* rfh);
 
   // Find the current RenderFrameHost for a given WebContents and extension
   // frame ID.
@@ skipping 98 matching lines @@
   // This lock protects |frame_id_map_| from being concurrently written on the
   // UI thread and read on the IO thread.
   base::Lock frame_id_map_lock_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionApiFrameIdMap);
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_BROWSER_EXTENSION_API_FRAME_ID_MAP_H_