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 1231 matching lines @@
     "renderer_host/media/video_capture_device_launch_observer.h",
     "renderer_host/media/video_capture_gpu_jpeg_decoder.cc",
     "renderer_host/media/video_capture_gpu_jpeg_decoder.h",
     "renderer_host/media/video_capture_host.cc",
     "renderer_host/media/video_capture_host.h",
     "renderer_host/media/video_capture_manager.cc",
     "renderer_host/media/video_capture_manager.h",
     "renderer_host/media/video_capture_provider.h",
     "renderer_host/media/video_capture_provider_switcher.cc",
     "renderer_host/media/video_capture_provider_switcher.h",
+    "renderer_host/mouse_wheel_phase_handler.cc",
+    "renderer_host/mouse_wheel_phase_handler.h",
     "renderer_host/native_web_keyboard_event_aura.cc",
     "renderer_host/native_web_keyboard_event_mac.mm",
     "renderer_host/offscreen_canvas_provider_impl.cc",
     "renderer_host/offscreen_canvas_provider_impl.h",
     "renderer_host/offscreen_canvas_surface_impl.cc",
     "renderer_host/offscreen_canvas_surface_impl.h",
     "renderer_host/overscroll_configuration.cc",
     "renderer_host/overscroll_controller.cc",
     "renderer_host/overscroll_controller.h",
     "renderer_host/overscroll_controller_delegate.h",
@@ skipping 883 matching lines @@
   if (!is_component_build) {
     public_deps = [
       ":browser",
     ]
   } else {
     public_deps = [
       "//third_party/leveldatabase",
     ]
   }
 }