GpuVSyncProvider with unit test

gpu/ipc/service/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//testing/test.gni")
 import("//build/config/ui.gni")
 if (is_mac) {
   import("//build/config/mac/mac_sdk.gni")
 }
 
@@ skipping 26 matching lines @@
     "gpu_command_buffer_stub.h",
     "gpu_config.h",
     "gpu_init.cc",
     "gpu_init.h",
     "gpu_memory_buffer_factory.cc",
     "gpu_memory_buffer_factory.h",
     "gpu_memory_manager.cc",
     "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",
     "image_transport_surface_delegate.cc",
     "image_transport_surface_delegate.h",
     "pass_through_image_transport_surface.cc",
     "pass_through_image_transport_surface.h",
     "switches.cc",
     "switches.h",
   ]
@@ skipping 76 matching lines @@
   ]
 }
 
 test("gpu_ipc_service_unittests") {
   configs += [ "//build/config:precompiled_headers" ]
   sources = [
     "gpu_channel_manager_unittest.cc",
     "gpu_channel_test_common.cc",
     "gpu_channel_test_common.h",
     "gpu_channel_unittest.cc",
+    "gpu_vsync_provider_unittest_win.cc",
   ]
   deps = [
     ":service",
     ":test_support",
     "//base",
     "//base/test:test_support",
     "//gpu/command_buffer/common",
     "//gpu/command_buffer/common:gles2_utils",
     "//gpu/command_buffer/service",
     "//gpu/config",
@@ skipping 14 matching lines @@
     deps += [ "//ui/android:ui_java" ]
   }
   if (is_mac) {
     sources += [ "gpu_memory_buffer_factory_io_surface_unittest.cc" ]
   }
   if (use_ozone) {
     sources += [ "gpu_memory_buffer_factory_ozone_native_pixmap_unittest.cc" ]
     deps += [ "//ui/ozone" ]
   }
 }