GN: Add -Wl,-z defs on linux and fix errors

ash/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("ash.gyp") ],
                           "scope",
@@ skipping 46 matching lines @@
     sources -= [
       "sticky_keys/sticky_keys_controller.cc",
       "sticky_keys/sticky_keys_controller.h",
     ]
 
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     cflags = [ "/wd4267" ]
   }
 
   if (use_x11) {
-    configs += [ "//build/config/linux:xfixes" ]
+    configs += [
+      "//build/config/linux:x11",
+      "//build/config/linux:xfixes",
+    ]
+    deps += [
+      "//ui/events:gesture_detection",
+      "//ui/events/platform",
+      "//ui/gfx/x",
+    ]
   } else {
     sources -= [
       "host/ash_window_tree_host_x11.cc",
       "host/ash_window_tree_host_x11.h",
       "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.cc",
       "wm/maximize_mode/scoped_disable_internal_mouse_and_keyboard_x11.h",
     ]
   }
 
   if (use_ozone) {
@@ skipping 298 matching lines @@
     "//content/test:test_support",
     "//skia",
     "//testing/gtest",
     "//ui/accessibility",
   ]
 
   if (is_chromeos) {
     deps += [ "//ui/display" ]
   }
 }