Show a warning bubble when the IME extension is activated.

chrome/browser/ui/toolbar/toolbar_actions_bar_observer.h

Index: chrome/browser/ui/toolbar/toolbar_actions_bar_observer.h
diff --git a/chrome/browser/ui/toolbar/toolbar_actions_bar_observer.h b/chrome/browser/ui/toolbar/toolbar_actions_bar_observer.h
index 63e78adaae0e93eb20c901c7452b5874262dda91..d65f17a90d18a6c5e4379acbc021a0f972413a29 100644
--- a/chrome/browser/ui/toolbar/toolbar_actions_bar_observer.h
+++ b/chrome/browser/ui/toolbar/toolbar_actions_bar_observer.h
@@ -17,6 +17,9 @@ class ToolbarActionsBarObserver {
   // often animated, chances are the bar did not finish resizing).
   virtual void OnToolbarActionsBarDidStartResize() {}
 
+  // Called when the delegate of the toolbar actions bar finishes animating.
+  virtual void OnToolbarActionsBarAnimationEnded() {}
+
   virtual ~ToolbarActionsBarObserver() {}
 };