Add FrameGenerator Unit Tests

services/ui/ws/BUILD.gn

Index: services/ui/ws/BUILD.gn
diff --git a/services/ui/ws/BUILD.gn b/services/ui/ws/BUILD.gn
index c93c16a61918c003c1788c348567ad57a66a6a16..2e0fed6a25a8250042e00a32651e75d17c19e5c8 100644
--- a/services/ui/ws/BUILD.gn
+++ b/services/ui/ws/BUILD.gn
@@ -225,6 +225,7 @@ service_test("mus_ws_unittests") {
     "event_dispatcher_unittest.cc",
     "event_matcher_unittest.cc",
     "focus_controller_unittest.cc",
+    "frame_generator_unittest.cc",
     "server_window_drawn_tracker_unittest.cc",
     "test_server_window_delegate.cc",
     "test_server_window_delegate.h",
@@ -255,6 +256,7 @@ service_test("mus_ws_unittests") {
     "//base/test:test_config",
     "//base/test:test_support",
     "//cc:cc",
+    "//cc:test_support",
     "//gpu/ipc/client",
     "//mojo/public/cpp/bindings:bindings",
     "//services/service_manager/public/cpp:service_test_support",