Write mojom and StructTraits for DisplaySnapshot.

ui/display/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")
 import("//testing/test.gni")
 
 component("display") {
   sources = [
     "display.cc",
     "display.h",
     "display_change_notifier.cc",
     "display_change_notifier.h",
     "display_export.h",
     "display_finder.cc",
     "display_finder.h",
     "display_layout.cc",
     "display_layout.h",
     "display_layout_builder.cc",
     "display_layout_builder.h",
     "display_list.cc",
     "display_list.h",
     "display_observer.cc",
     "display_observer.h",
+    "display_snapshot_mojo.cc",
+    "display_snapshot_mojo.h",
     "display_switches.cc",
     "display_switches.h",
     "fake_display_delegate.cc",
     "fake_display_delegate.h",
     "fake_display_snapshot.cc",
     "fake_display_snapshot.h",
     "ios/screen_ios.mm",
     "mac/screen_mac.mm",
     "screen.cc",
     "screen.h",
@@ skipping 145 matching lines @@
     sources -= [ "display_change_notifier_unittest.cc" ]
   }
 
   if (is_chromeos && use_x11) {
     sources += [
       "manager/chromeos/x11/display_util_x11_unittest.cc",
       "manager/chromeos/x11/native_display_event_dispatcher_x11_unittest.cc",
     ]
   }
 }