Add DirectComposition overlay support.

gpu/BUILD.gn

 # Copyright 2014 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/libfuzzer/fuzzer_test.gni")
 import("//testing/test.gni")
 import("//build/config/ui.gni")
 
 config("gpu_implementation") {
   defines = [ "GPU_IMPLEMENTATION" ]
@@ skipping 192 matching lines @@
     "//ui/gl",
   ]
 
   libs = []
 
   if (is_android) {
     libs += [ "android" ]
     deps += [ "//ui/android:ui_java" ]
   } else if (is_mac) {
     libs += [ "IOSurface.framework" ]
+  } else if (is_win) {
+    deps += [
+      "//ui/platform_window",
+      "//ui/platform_window:platform_impls",
+    ]
   }
 }
 
 test("gpu_unittests") {
   sources = [
     "command_buffer/client/buffer_tracker_unittest.cc",
     "command_buffer/client/client_test_helper.cc",
     "command_buffer/client/client_test_helper.h",
     "command_buffer/client/cmd_buffer_helper_test.cc",
     "command_buffer/client/fenced_allocator_test.cc",
@@ skipping 230 matching lines @@
       "//base/third_party/dynamic_annotations",
       "//gpu/command_buffer/common:gles2_utils",
       "//ui/gfx/geometry",
       "//ui/gl",
       "//ui/gl:test_support",
     ]
 
     libfuzzer_options = [ "max_len=16384" ]
   }
 }