Process DisplaySnapshots in PlatformScreen.

services/ui/display/BUILD.gn

Index: services/ui/display/BUILD.gn
diff --git a/services/ui/display/BUILD.gn b/services/ui/display/BUILD.gn
index d542ee79f1fe5209548e543e4ffd5e7319f3cf21..da6a727635ef8d32764e40a505e9834da1fe61c1 100644
--- a/services/ui/display/BUILD.gn
+++ b/services/ui/display/BUILD.gn
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
+import("//testing/test.gni")
 
 source_set("display") {
   sources = [
@@ -33,3 +34,24 @@ source_set("display") {
     ]
   }
 }
+
+if (use_ozone) {
+  test("display_service_unittests") {
+    sources = [
+      "platform_screen_ozone_unittests.cc",
+    ]
+
+    deps = [
+      ":display",
+      "//base",
+      "//base/test:run_all_unittests",
+      "//base/test:test_support",
+      "//testing/gmock",
+      "//testing/gtest",
+      "//ui/display",
+      "//ui/gfx",
+      "//ui/gfx:test_support",
+      "//ui/ozone",
+    ]
+  }
+}