Fix 'gn check' errors in //ui/* and add to default checked set

ui/gfx/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("//build/config/ui.gni")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/config.gni")
   import("//build/config/android/rules.gni")
@@ skipping 70 matching lines @@
     "win/singleton_hwnd.cc",
     "win/singleton_hwnd.h",
     "win/window_impl.cc",
     "win/window_impl.h",
   ]
 
   defines = [ "GFX_IMPLEMENTATION" ]
 
   deps = [
     ":gfx_export",
+    "//base/third_party/dynamic_annotations",
+    "//base:base_static",
     "//base:i18n",
-    "//base:base_static",
-    "//base/third_party/dynamic_annotations",
     "//skia",
     "//third_party/harfbuzz-ng",
     "//third_party/libpng",
     "//third_party/zlib",
     "//ui/gfx/geometry",
   ]
   public_deps = [
     "//base",
     "//skia",
     "//third_party/icu",
@@ skipping 40 matching lines @@
       "/wd4267",  # TODO(jschuh): C4267: http://crbug.com/167187 size_t -> int.
       "/wd4324",  # Structure was padded due to __declspec(align()), which is
                   # uninteresting.
     ]
   }
 
   # Linux.
   if (is_linux) {
     configs += [ "//build/config/linux:fontconfig" ]
   }
+
+  if (use_x11) {
+    deps += [ "//ui/gfx/x" ]
+  }
 }
 
 # Looking for gfx_geometry? It's //ui/gfx/geometry:geometry
 
 source_set("test_support") {
   testonly = true
   sources = [
     "test/fontconfig_util_linux.cc",
     "test/fontconfig_util_linux.h",
     "test/gfx_util.cc",
@@ skipping 39 matching lines @@
       "animation/slide_animation_unittest.cc",
       "animation/tween_unittest.cc",
       "codec/jpeg_codec_unittest.cc",
       "codec/png_codec_unittest.cc",
       "display_change_notifier_unittest.cc",
       "display_unittest.cc",
       "geometry/box_unittest.cc",
       "geometry/cubic_bezier_unittest.cc",
       "geometry/insets_unittest.cc",
       "geometry/matrix3_unittest.cc",
+      "geometry/point3_unittest.cc",
       "geometry/point_unittest.cc",
-      "geometry/point3_unittest.cc",
       "geometry/quad_unittest.cc",
       "geometry/r_tree_unittest.cc",
       "geometry/rect_unittest.cc",
       "geometry/safe_integer_conversions_unittest.cc",
       "geometry/scroll_offset_unittest.cc",
       "geometry/size_unittest.cc",
       "geometry/vector2d_unittest.cc",
       "geometry/vector3d_unittest.cc",
       "sequential_id_generator_unittest.cc",
       "skrect_conversion_unittest.cc",
@@ skipping 54 matching lines @@
 if (is_android) {
   generate_jni("gfx_jni_headers") {
     sources = [
       "../android/java/src/org/chromium/ui/gfx/BitmapHelper.java",
       "../android/java/src/org/chromium/ui/gfx/DeviceDisplayInfo.java",
       "../android/java/src/org/chromium/ui/gfx/ViewConfigurationHelper.java",
     ]
     jni_package = "gfx"
   }
 }