CustomButton: restrict animation repaints to buttons that actually animate

ui/views/controls/button/custom_button.cc

Index: ui/views/controls/button/custom_button.cc
diff --git a/ui/views/controls/button/custom_button.cc b/ui/views/controls/button/custom_button.cc
index 63092b9b8b3bf32ba476981eb37a8e138c5e8b1f..73d94ebe39b067ee674297e0a06b1dac78a0e4ba 100644
--- a/ui/views/controls/button/custom_button.cc
+++ b/ui/views/controls/button/custom_button.cc
@@ -94,6 +94,8 @@ void CustomButton::SetState(ButtonState state) {
 }
 
 void CustomButton::StartThrobbing(int cycles_til_stop) {
+  if (!animate_on_state_change_)
+    return;
   is_throbbing_ = true;
   hover_animation_.StartThrobbing(cycles_til_stop);
 }
@@ -403,7 +405,6 @@ CustomButton::CustomButton(ButtonListener* listener)
     : Button(listener),
       state_(STATE_NORMAL),
       hover_animation_(this),
-      animate_on_state_change_(true),
       is_throbbing_(false),
       triggerable_event_flags_(ui::EF_LEFT_MOUSE_BUTTON),
       request_focus_on_press_(false),