Custom buttons should only handle accelerators when focused.

ui/views/controls/button/custom_button.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/controls/button/custom_button.h"
 
 #include "ui/accessibility/ax_view_state.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
 #include "ui/events/keycodes/keyboard_codes.h"
@@ skipping 233 matching lines @@
     event->StopPropagation();
   } else if (event->type() == ui::ET_GESTURE_TAP_CANCEL ||
              event->type() == ui::ET_GESTURE_END) {
     SetState(STATE_NORMAL);
   }
   if (!event->handled())
     Button::OnGestureEvent(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(
       ui::ET_MOUSE_RELEASED, gfx::Point(), gfx::Point(), ui::EventTimeForNow(),
       ui::EF_LEFT_MOUSE_BUTTON, ui::EF_LEFT_MOUSE_BUTTON);
   NotifyClick(synthetic_event);
   return true;
 }
 
 void CustomButton::ShowContextMenu(const gfx::Point& p,
@@ skipping 107 matching lines @@
     const ViewHierarchyChangedDetails& details) {
   if (!details.is_add && state_ != STATE_DISABLED)
     SetState(STATE_NORMAL);
 }
 
 void CustomButton::OnBlur() {
   if (IsHotTracked())
     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