Changed GpuVSyncProvider to implement gfx::VSyncProvider

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_vsync_provider_win.h",
     "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 115 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" ]
   }
 }