Modify experimental identity flow to display scope descriptions and details.

chrome/browser/extensions/webstore_installer.h

Index: chrome/browser/extensions/webstore_installer.h
diff --git a/chrome/browser/extensions/webstore_installer.h b/chrome/browser/extensions/webstore_installer.h
index 4312447948f73469463f7410f6d90d91831ec317..7ba017521a73a6697a3d40e86be23bc866e7f193 100644
--- a/chrome/browser/extensions/webstore_installer.h
+++ b/chrome/browser/extensions/webstore_installer.h
@@ -85,6 +85,9 @@ class WebstoreInstaller : public content::NotificationObserver,
     // so there's no need to show it again.
     bool skip_install_dialog;
 
+    // Whether we should record an oauth2 grant for the extensions.
+    bool record_oauth2_grant;
+
    private:
     Approval();
   };