Fixed Back/Forward buttons to not hide ink drop when long press shows drop down menu.

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 323 matching lines @@
 
 void CustomButton::ShowContextMenu(const gfx::Point& p,
                                    ui::MenuSourceType source_type) {
   if (!context_menu_controller())
     return;
 
   // We're about to show the context menu. Showing the context menu likely means
   // we won't get a mouse exited and reset state. Reset it now to be sure.
   if (state_ != STATE_DISABLED)
     SetState(STATE_NORMAL);
-  if (ink_drop_delegate_) {
+  if (hide_ink_drop_when_showing_context_menu_ && ink_drop_delegate_) {
     ink_drop_delegate_->SetHovered(false);
     ink_drop_delegate_->OnAction(InkDropState::HIDDEN);
   }
   View::ShowContextMenu(p, source_type);
 }
 
 void CustomButton::OnDragDone() {
   // Only reset the state to normal if the button isn't currently disabled
   // (since disabled buttons may still be able to be dragged).
   if (state_ != STATE_DISABLED)
@@ skipping 81 matching lines @@
       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_(true),
       ink_drop_delegate_(nullptr),
       notify_action_(NOTIFY_ON_RELEASE),
       has_ink_drop_action_on_click_(false),
       ink_drop_action_on_click_(InkDropState::ACTION_TRIGGERED),
+      hide_ink_drop_when_showing_context_menu_(true),
       ink_drop_base_color_(gfx::kPlaceholderColor),
       md_focus_ring_(nullptr) {
   hover_animation_.SetSlideDuration(kHoverFadeDurationMs);
 }
 
 void CustomButton::StateChanged() {
 }
 
 bool CustomButton::IsTriggerableEvent(const ui::Event& event) {
   return event.type() == ui::ET_GESTURE_TAP_DOWN ||
@@ skipping 51 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