Adding phase info to wheel events migrated to wheel phase handler class.

content/browser/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("//gpu/vulkan/features.gni")
 import("//media/media_options.gni")
 import("//ppapi/features/features.gni")
 import("//printing/features/features.gni")
@@ skipping 1100 matching lines @@
     "renderer_host/input/input_router_config_helper.cc",
     "renderer_host/input/input_router_config_helper.h",
     "renderer_host/input/input_router_impl.cc",
     "renderer_host/input/input_router_impl.h",
     "renderer_host/input/legacy_touch_event_queue.cc",
     "renderer_host/input/legacy_touch_event_queue.h",
     "renderer_host/input/motion_event_web.cc",
     "renderer_host/input/motion_event_web.h",
     "renderer_host/input/mouse_wheel_event_queue.cc",
     "renderer_host/input/mouse_wheel_event_queue.h",
+    "renderer_host/input/mouse_wheel_phase_handler.cc",
+    "renderer_host/input/mouse_wheel_phase_handler.h",
     "renderer_host/input/mouse_wheel_rails_filter_mac.cc",
     "renderer_host/input/mouse_wheel_rails_filter_mac.h",
     "renderer_host/input/passthrough_touch_event_queue.cc",
     "renderer_host/input/passthrough_touch_event_queue.h",
     "renderer_host/input/render_widget_host_latency_tracker.cc",
     "renderer_host/input/render_widget_host_latency_tracker.h",
     "renderer_host/input/stylus_text_selector.cc",
     "renderer_host/input/stylus_text_selector.h",
     "renderer_host/input/synthetic_gesture.cc",
     "renderer_host/input/synthetic_gesture.h",
@@ skipping 1014 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }