Custom buttons should only handle accelerators when focused.

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 61b595bbfeb2f059327527ad3c1ef18e76afb270..55a543239d00923241dbb73075be4f772814e9ba 100644
--- a/ui/views/controls/button/custom_button.cc
+++ b/ui/views/controls/button/custom_button.cc
@@ -251,6 +251,10 @@ void CustomButton::OnGestureEvent(ui::GestureEvent* event) {
 }
 
 bool CustomButton::AcceleratorPressed(const ui::Accelerator& accelerator) {
+  if ((IsChildWidget() && !FocusInChildWidget()) ||

[sky, 2015/11/17 14:22:39]

This is subtle enough that it is worth a comment.

[meacer, 2015/11/17 18:56:26]

Done.

+      (!IsChildWidget() && !GetWidget()->IsActive())) {
+    return false;
+  }
   SetState(STATE_NORMAL);
   // TODO(beng): remove once NotifyClick takes ui::Event.
   ui::MouseEvent synthetic_event(
@@ -378,4 +382,14 @@ void CustomButton::OnBlur() {
     SetState(STATE_NORMAL);
 }
 
+bool CustomButton::IsChildWidget() const {
+  return GetWidget() && GetWidget()->GetTopLevelWidget() != GetWidget();
+}
+
+bool CustomButton::FocusInChildWidget() const {
+  return GetWidget() &&
+         GetWidget()->GetRootView()->Contains(
+             GetFocusManager()->GetFocusedView());
+}
+
 }  // namespace views