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

ui/views/controls/button/custom_button.h

Index: ui/views/controls/button/custom_button.h
diff --git a/ui/views/controls/button/custom_button.h b/ui/views/controls/button/custom_button.h
index d3fbdfa214a281ce7862cf758ce6caee1f7f5c98..afcefbe9bf8441fc06fb3b4d6b8c7a0576a153ef 100644
--- a/ui/views/controls/button/custom_button.h
+++ b/ui/views/controls/button/custom_button.h
@@ -76,6 +76,12 @@ class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
     notify_action_ = notify_action;
   }
 
+  void set_hide_ink_drop_when_showing_context_menu(
+      bool hide_ink_drop_when_showing_context_menu) {
+    hide_ink_drop_when_showing_context_menu_ =
+        hide_ink_drop_when_showing_context_menu;
+  }
+
   void set_ink_drop_base_color(SkColor color) { ink_drop_base_color_ = color; }
 
   void SetHotTracked(bool is_hot_tracked);
@@ -197,6 +203,10 @@ class VIEWS_EXPORT CustomButton : public Button, public gfx::AnimationDelegate {
   // is clicked.
   InkDropState ink_drop_action_on_click_;
 
+  // When true, the ink drop ripple and hover will be hidden prior to showing
+  // the context menu.
+  bool hide_ink_drop_when_showing_context_menu_;
+
   // The color of the ripple and hover.
   SkColor ink_drop_base_color_;