Adding tools menu responsiveness metric.

ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.mm

Index: ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.mm
diff --git a/ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.mm b/ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.mm
index e6bd95496bce10cbe3a5a71d22163a90f2dbbd75..4664b81b054d99021c03c3f7f5d707d5948c7f05 100644
--- a/ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.mm
+++ b/ios/chrome/browser/ui/tools_menu/tools_menu_view_controller.mm
@@ -19,6 +19,7 @@
 #include "ios/chrome/browser/ui/commands/ios_command_ids.h"
 #import "ios/chrome/browser/ui/reading_list/reading_list_menu_notification_delegate.h"
 #import "ios/chrome/browser/ui/reading_list/reading_list_menu_notifier.h"
+#import "ios/chrome/browser/ui/toolbar/toolbar_controller.h"
 #import "ios/chrome/browser/ui/tools_menu/reading_list_menu_view_item.h"
 #import "ios/chrome/browser/ui/tools_menu/tools_menu_constants.h"
 #import "ios/chrome/browser/ui/tools_menu/tools_menu_model.h"
@@ -434,6 +435,11 @@ NS_INLINE void AnimateInViews(NSArray* views,
   [CATransaction
       setAnimationTimingFunction:TimingFunction(ios::material::CurveEaseInOut)];
   [CATransaction setAnimationDuration:ios::material::kDuration5];
+  [CATransaction setCompletionBlock:^{
+    [[NSNotificationCenter defaultCenter]
+        postNotificationName:kMenuDidShowNotification
+                      object:nil];
+  }];
   AnimateInViews([toolsCell allButtons], 10, 0);
   AnimateInViews(visibleCells, 0, -10);
   [CATransaction commit];