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",
@@ skipping 12 matching lines @@
     "display_observer.cc",
     "display_observer.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",
+    "mojo/display_snapshot_mojo.cc",

[kylechar, 2017/02/10 21:40:29]

I would move these files so they are
src/ui/display/display_snapshot_mojo.[cc|h]. Usually only the mojom and
StructTrait definitions go in the mojo subdir.

+    "mojo/display_snapshot_mojo.h",
     "screen.cc",
     "screen.h",
     "screen_aura.cc",
     "screen_base.cc",
     "screen_base.h",
     "win/display_info.cc",
     "win/display_info.h",
     "win/dpi.cc",
     "win/dpi.h",
     "win/scaling_util.cc",
@@ skipping 137 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",
     ]
   }
 }