Add FakeDisplayDelegate for off device usage.

ui/display/BUILD.gn

Index: ui/display/BUILD.gn
diff --git a/ui/display/BUILD.gn b/ui/display/BUILD.gn
index 3b1cdc5211e8a05bab00cd9996cd15a499506864..d7d360ff7d3bd79dd9a316cbdf78ac1cc431d49d 100644
--- a/ui/display/BUILD.gn
+++ b/ui/display/BUILD.gn
@@ -23,16 +23,6 @@ component("display") {
     "chromeos/query_content_protection_task.h",
     "chromeos/update_display_configuration_task.cc",
     "chromeos/update_display_configuration_task.h",
-    "chromeos/x11/display_mode_x11.cc",
-    "chromeos/x11/display_mode_x11.h",
-    "chromeos/x11/display_snapshot_x11.cc",
-    "chromeos/x11/display_snapshot_x11.h",
-    "chromeos/x11/display_util_x11.cc",
-    "chromeos/x11/display_util_x11.h",
-    "chromeos/x11/native_display_delegate_x11.cc",
-    "chromeos/x11/native_display_delegate_x11.h",
-    "chromeos/x11/native_display_event_dispatcher_x11.cc",
-    "chromeos/x11/native_display_event_dispatcher_x11.h",
     "display.cc",
     "display.h",
     "display_change_notifier.cc",
@@ -46,6 +36,10 @@ component("display") {
     "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",
     "manager/display_layout.cc",
@@ -86,34 +80,33 @@ component("display") {
   ]
 
   if (is_chromeos && use_x11) {
+    sources += [
+      "chromeos/x11/display_mode_x11.cc",
+      "chromeos/x11/display_mode_x11.h",
+      "chromeos/x11/display_snapshot_x11.cc",
+      "chromeos/x11/display_snapshot_x11.h",
+      "chromeos/x11/display_util_x11.cc",
+      "chromeos/x11/display_util_x11.h",
+      "chromeos/x11/native_display_delegate_x11.cc",
+      "chromeos/x11/native_display_delegate_x11.h",
+      "chromeos/x11/native_display_event_dispatcher_x11.cc",
+      "chromeos/x11/native_display_event_dispatcher_x11.h",
+    ]
+
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xext",
       "//build/config/linux:xi",
       "//build/config/linux:xrandr",
     ]
+
     deps += [ "//ui/events/platform" ]
   }
 
-  deps += []
   if (use_x11) {
     deps += [ "//ui/gfx/x" ]
   }
 
-  if (is_chromeos && use_ozone) {
-    sources -= [
-      "chromeos/x11/display_mode_x11.cc",
-      "chromeos/x11/display_mode_x11.h",
-      "chromeos/x11/display_snapshot_x11.cc",
-      "chromeos/x11/display_snapshot_x11.h",
-      "chromeos/x11/display_util_x11.cc",
-      "chromeos/x11/display_util_x11.h",
-      "chromeos/x11/native_display_delegate_x11.cc",
-      "chromeos/x11/native_display_delegate_x11.h",
-      "chromeos/x11/native_display_event_dispatcher_x11.cc",
-      "chromeos/x11/native_display_event_dispatcher_x11.h",
-    ]
-  }
   if (!use_aura) {
     sources -= [ "screen_aura.cc" ]
   }