GpuVSyncProvider with unit test

gpu/ipc/service/BUILD.gn

Index: gpu/ipc/service/BUILD.gn
diff --git a/gpu/ipc/service/BUILD.gn b/gpu/ipc/service/BUILD.gn
index f6c126d19dbde5bd232afe97a76a438ccee229c0..365d6d655069b5cffb411249ce8ae2a7a9e1b5cc 100644
--- a/gpu/ipc/service/BUILD.gn
+++ b/gpu/ipc/service/BUILD.gn
@@ -44,6 +44,9 @@ target(link_target_type, "ipc_service_sources") {
     "gpu_memory_manager.h",
     "gpu_memory_tracking.cc",
     "gpu_memory_tracking.h",
+    "gpu_vsync_provider.h",
+    "gpu_vsync_provider_posix.cc",
+    "gpu_vsync_provider_win.cc",
     "gpu_watchdog_thread.cc",
     "gpu_watchdog_thread.h",
     "image_transport_surface.h",
@@ -140,6 +143,7 @@ test("gpu_ipc_service_unittests") {
     "gpu_channel_test_common.cc",
     "gpu_channel_test_common.h",
     "gpu_channel_unittest.cc",
+    "gpu_vsync_provider_unittest_win.cc",
   ]
   deps = [
     ":service",