Add GN Build file for ui/events/ozone.

BUILD.gn

 # Copyright (c) 2013 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.
 
 # This is the root build file for GN. GN will start processing by loading this
 # file, and recursively load all dependencies until all dependencies are either
 # resolved or known not to exist (which will cause the build to fail). So if
 # you add a new build file, there must be some path of dependencies from this
 # file to your new one or GN won't know about it.
 
+import("//build/config/ui.gni")
+
 # In GN, a "group" is a dummy target that just lists other targets.
 group("root") {
   # Note that some dependencies are commented out. These are things that are
   # currently written but not hooked up to the build yet. They may need to be
   # completed or possibly just tested and then re-enabled.
   deps = [
     # This is a temporary test of the not-yet-complete NaCl cross-compilation.
     #"//base(//build/toolchain/nacl:x86_newlib)",
 
     "//apps/common/api:apps_api",
@@ skipping 106 matching lines @@
       # "//third_party/WebKit/Source/platform",
       "//third_party/WebKit/Source/wtf",  # TODO(brettw) re-enable for Android.
       "//sandbox",
       "//tools/gn",
 
       # Not tested on Android yet:
       "//webkit/browser:storage",
       "//webkit/child",
     ]
   }
+
+  if (use_ozone) {
+    deps += [
+      "//ui/events/ozone:events_ozone",
+      "//ui/events/ozone:events_ozone_evdev",
+    ]
+  }
 }