Improve GN header checker, make //ui pass.

ui/views/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/features.gni")
 import("//build/config/ui.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("views.gyp") ],
     "scope",
     [ "views.gyp" ])
 
 component("views") {
   sources = gypi_values.views_sources
 
   defines = [ "VIEWS_IMPLEMENTATION" ]
 
   deps = [
-    "//base",
     "//base:i18n",
     "//base/third_party/dynamic_annotations",
     "//skia",
     "//third_party/icu",
     "//third_party/wtl",
     "//ui/accessibility",
+    "//ui/aura",
+    "//ui/native_theme",
+    "//ui/resources",
+    "//ui/strings",
+    "//ui/wm",
+    "//url",
+  ]
+
+  public_deps = [
+    "//base",
     "//ui/accessibility:ax_gen",
-    "//ui/aura",
     "//ui/base",
     "//ui/compositor",
     "//ui/events",
     "//ui/events:events_base",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
-    "//ui/native_theme",
-    "//ui/resources",
-    "//ui/strings",
-    "//ui/wm",
-    "//url",
   ]
 
-  forward_dependent_configs_from = [ "//ui/accessibility:ax_gen" ]
-
   if (use_x11 && !is_chromeos) {
     deps += [ "//ui/display/util" ]
   }
   if (is_linux && !is_chromeos) {
     sources -= [ "window/window_button_order_provider.cc" ]
     deps += [ "//ui/shell_dialogs" ]
   } else {
     sources -= [
       "linux_ui/linux_ui.h",
       "linux_ui/linux_ui.cc",
@@ skipping 23 matching lines @@
   if (use_ozone) {
     deps += [ "//ui/ozone" ]
   }
   if (use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xrandr",
     ]
     deps += [
       "//ui/events/platform/x11",
+      "//ui/gfx/x",
     ]
   }
 
   if (use_aura) {
     sources += gypi_values.views_aura_sources
     if (!is_chromeos) {
       sources += gypi_values.views_desktop_aura_sources
       if (use_x11) {
         sources += gypi_values.views_desktop_aura_x11_sources
       } else if (is_win) {
         sources += gypi_values.views_desktop_aura_win_sources
       } else if (use_ozone) {
         sources += gypi_values.views_desktop_aura_ozone_sources
       }
     }
   }
 }
 
 static_library("test_support") {
   testonly = true
   sources = gypi_values.views_test_support_sources
 
+  public_deps = [
+    ":views",
+  ]
   deps = [
-    ":views",
     "//base",
     "//ipc:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/aura",
     "//ui/base",
     "//ui/compositor",
     "//ui/compositor:test_support",
     "//ui/events",
     "//ui/events:events_base",
     "//ui/events:test_support",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/wm",
   ]
 
   if (is_chromeos) {
     sources -= [
       "test/ui_controls_factory_desktop_aurax11.cc",
       "test/ui_controls_factory_desktop_aurax11.h",
     ]
   }
   if (use_aura) {
     sources += gypi_values.views_test_support_aura_sources
     deps += [ "//ui/aura:test_support" ]
   }
+  if (use_x11) {
+    deps += [ "//ui/gfx/x" ]
+  }
 }
 
 test("views_unittests") {
   sources = gypi_values.views_unittests_sources
 
   deps = [
     ":test_support",
-    ":views",
     "//base",
     "//base:i18n",
     "//base/allocator",
     "//base/test:test_support",
     "//skia",
     "//testing/gtest",
     "//third_party/icu",
     "//ui/accessibility",
     "//ui/aura",
     "//ui/base",
     "//ui/base:test_support",
-    "//ui/compositor",
-    "//ui/events",
+    "//ui/compositor:test_support",
+    "//ui/events:test_support",
     "//ui/events:events_base",
     "//ui/events/platform",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
+    "//ui/resources",
+    "//ui/strings",
     "//ui/wm",
     "//url",
   ]
 
   if (is_chromeos) {
     sources -= [
       "ime/input_method_bridge_unittest.cc",
     ]
   }
 
@@ skipping 17 matching lines @@
     #},
   }
 
   if (use_x11) {
     configs += [
       "//build/config/linux:x11",
       "//build/config/linux:xext",
     ]
     deps += [
       "//ui/events/platform/x11",
+      "//ui/gfx/x",
     ]
   }
 
   if (use_aura) {
     sources += gypi_values.views_unittests_aura_sources
     deps += [ "//ui/aura:test_support" ]
     if (!is_chromeos) {
       sources += gypi_values.views_unittests_desktop_aura_sources
     }
   }
   if (use_x11) {
-    deps += [ "//ui/events/platform/x11" ]
+    deps += [
+      "//ui/events/platform/x11",
+      "//ui/gfx/x",
+    ]
   }
 
   if (is_mac) {
     # views_unittests not yet compiling on Mac. http://crbug.com/378134
     sources -= [
       "bubble/bubble_window_targeter_unittest.cc",
       "controls/button/custom_button_unittest.cc",
       "controls/button/menu_button_unittest.cc",
       "controls/native/native_view_host_unittest.cc",
       "controls/menu/menu_controller_unittest.cc",
@@ skipping 20 matching lines @@
       "//testing/gtest",
       "//ui/aura",
       "//ui/compositor",
       "//ui/resources",
       "//ui/resources:ui_test_pak",
       "//ui/strings",
       "//ui/wm",
     ]
   }
 }