webRequest: reliably determine tabId

extensions/browser/extension_api_frame_id_map.h

Index: extensions/browser/extension_api_frame_id_map.h
diff --git a/extensions/browser/extension_api_frame_id_map.h b/extensions/browser/extension_api_frame_id_map.h
index 62330626df9d875e431caad66f480b852d4d1d58..bd2652dea7bc5ad5df248ec7924314855b03c683 100644
--- a/extensions/browser/extension_api_frame_id_map.h
+++ b/extensions/browser/extension_api_frame_id_map.h
@@ -97,6 +97,11 @@ class ExtensionApiFrameIdMap {
   // Get the extension API frame ID for the parent of |navigation_handle|.
   static int GetParentFrameId(content::NavigationHandle* navigation_handle);
 
+  // Get the tab and window ID for a |rfh|.
+  static void GetTabAndWindowId(content::RenderFrameHost* rfh,
+                                int* tab_id_out,
+                                int* window_id_out);
+
   // Find the current RenderFrameHost for a given WebContents and extension
   // frame ID.
   // Returns nullptr if not found.