Don't allow events to be swallowed by MdFocusRing.

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/base/material_design/material_design_controller.h"
 #include "ui/events/event.h"
 #include "ui/events/event_utils.h"
@@ skipping 30 matching lines @@
 const int kFocusBorderOutset = -2;
 
 // The corner radius of the focus border roundrect.
 const int kFocusBorderCornerRadius = 3;
 
 class MdFocusRing : public views::View {
  public:
   MdFocusRing() {
     SetPaintToLayer(true);
     layer()->SetFillsBoundsOpaquely(false);
+
+    // Don't accept input events.
+    SetEnabled(false);
   }
   ~MdFocusRing() override {}
 
   void OnPaint(gfx::Canvas* canvas) override {
     CustomButton::PaintMdFocusRing(canvas, this);
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(MdFocusRing);
 };
@@ skipping 443 matching lines @@
   Button::NotifyClick(event);
 }
 
 void CustomButton::OnClickCanceled(const ui::Event& event) {
   if (ink_drop_delegate())
     ink_drop_delegate()->OnAction(views::InkDropState::HIDDEN);
   Button::OnClickCanceled(event);
 }
 
 }  // namespace views