Re-adding and fixing StructTraitsTest for events and latency.

ui/latency/BUILD.gn

Index: ui/latency/BUILD.gn
diff --git a/ui/latency/BUILD.gn b/ui/latency/BUILD.gn
index bcb868ceb665f5aaa394292429f9c1f39c06a453..5afbb031a17702a7a757367ece03950cbfb2cbe4 100644
--- a/ui/latency/BUILD.gn
+++ b/ui/latency/BUILD.gn
@@ -24,8 +24,8 @@ test("latency_unittests") {
   deps = [
     ":latency",
     "//base",
-    "//base/test:run_all_unittests",
     "//base/test:test_support",
+    "//mojo/edk/test:run_all_unittests",
     "//testing/gmock",
     "//testing/gtest",
   ]
@@ -33,11 +33,13 @@ test("latency_unittests") {
   if (!is_ios) {
     sources += [
       "ipc/latency_info_param_traits_unittest.cc",
-      "mojo/struct_traits_unittest",
+      "mojo/struct_traits_unittest.cc",
     ]
     deps += [
       "//ipc:test_support",
+      "//mojo/public/cpp/bindings",
       "//ui/latency/ipc",
+      "//ui/latency/mojo:test_interfaces",
     ]
   }
 }