cc: Add missing xdisplaycheck data dependency for tests.

cc/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/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 711 matching lines @@
     "//testing/gtest",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gfx:test_support",
     "//ui/gl",
   ]
 
   if (!is_android) {  # TODO(GYP) Enable on Android when osmesa links.
     deps += [ "//third_party/mesa:osmesa" ]
   }
+
+  if (use_x11) {
+    datadeps += [ "//tools/xdisplaycheck" ]
+  }
 }
 
 test("cc_unittests") {
   sources = [
     "animation/animation_unittest.cc",
     "animation/keyframed_animation_curve_unittest.cc",
     "animation/layer_animation_controller_unittest.cc",
     "animation/scroll_offset_animation_curve_unittest.cc",
     "animation/scrollbar_animation_controller_linear_fade_unittest.cc",
     "animation/scrollbar_animation_controller_thinning_unittest.cc",
@@ skipping 174 matching lines @@
     "//media",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 }