Listen to Display reconfiguration and notify DisplayObservers on Mac.

ui/gfx/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/ui.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
 }
@@ skipping 61 matching lines @@
     "color_analysis.cc",
     "color_analysis.h",
     "color_profile.cc",
     "color_profile.h",
     "color_profile_mac.mm",
     "color_profile_win.cc",
     "color_utils.cc",
     "color_utils.h",
     "display.cc",
     "display.h",
+    "display_change_notifier.cc",
+    "display_change_notifier.h",
     "display_observer.cc",
     "display_observer.h",
     "favicon_size.cc",
     "favicon_size.h",
     "font.cc",
     "font.h",
     "font_fallback_win.cc",
     "font_fallback_win.h",
     "font_list.cc",
     "font_list.h",
@@ skipping 321 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }