Fix 'VirtualKeyboard.InitLatency.FirstLoad' metrics to be recorded for any keyboards.

ui/keyboard/keyboard_controller.cc

Index: ui/keyboard/keyboard_controller.cc
diff --git a/ui/keyboard/keyboard_controller.cc b/ui/keyboard/keyboard_controller.cc
index c5569e3d4cdaa9518215263079495792a6ef1ee8..b6cda6ee816ea2b05c8562c21a8185fcead18e48 100644
--- a/ui/keyboard/keyboard_controller.cc
+++ b/ui/keyboard/keyboard_controller.cc
@@ -510,6 +510,8 @@ bool KeyboardController::WillHideKeyboard() const {
 }
 
 void KeyboardController::ShowAnimationFinished() {
+  MarkKeyboardLoadFinished();
+
   // Notify observers after animation finished to prevent reveal desktop
   // background during animation.
   NotifyKeyboardBoundsChanging(container_->bounds());