Allow InkDropRipple to co-exist with highlight

ui/views/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 config("flags") {
   defines = [ "TOOLKIT_VIEWS=1" ]
 }
 
 component("views") {
   all_dependent_configs = [ ":flags" ]
   sources = [
     "accessibility/native_view_accessibility.cc",
     "accessibility/native_view_accessibility.h",
     "accessibility/native_view_accessibility_win.cc",
     "accessibility/native_view_accessibility_win.h",
     "accessible_pane_view.cc",
     "accessible_pane_view.h",
     "animation/bounds_animator.cc",
     "animation/bounds_animator.h",
+    "animation/empty_ink_drop_ripple.cc",
+    "animation/empty_ink_drop_ripple.h",
     "animation/flood_fill_ink_drop_ripple.cc",
     "animation/flood_fill_ink_drop_ripple.h",
     "animation/ink_drop.h",
     "animation/ink_drop_animation_ended_reason.cc",
     "animation/ink_drop_animation_ended_reason.h",
     "animation/ink_drop_highlight.cc",
     "animation/ink_drop_highlight.h",
     "animation/ink_drop_highlight_observer.h",
     "animation/ink_drop_host.h",
     "animation/ink_drop_host_view.cc",
@@ skipping 965 matching lines @@
       "//ui/base:test_support",
       "//ui/compositor",
       "//ui/events:test_support",
       "//ui/gl:test_support",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/strings",
     ]
   }
 }