Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/platform/x11/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.
+
+component("x11") {
+  output_name = "x11_events_platform"
+
+  sources = [
+    "x11_event_source.cc",
+    "x11_event_source.h",
+    "x11_event_source_glib.cc",
+    "x11_event_source_libevent.cc",
+    "x11_hotplug_event_handler.cc",
+    "x11_hotplug_event_handler.h",
+  ]
+
+  defines = [ "EVENTS_IMPLEMENTATION" ]
+
+  configs += [ "//build/config/linux:x11" ]
+
+  public_deps = [
+    "//ui/events",
+    "//ui/events:events_base",
+    "//ui/events/devices",
+    "//ui/events/platform",
+    "//ui/gfx/x",
+  ]
+
+  deps = [
+    "//base",
+  ]
+
+  if (use_glib) {
+    sources -= [ "x11_event_source_libevent.cc" ]
+
+    configs += [ "//build/config/linux:glib" ]
+  } else {
+    sources -= [ "x11_event_source_glib.cc" ]
+  }
+}