Work on the Android GN build.

ui/events/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")
 
 static_library("dom4_keycode_converter") {
   sources = [
     "keycodes/dom4/keycode_converter.cc",
     "keycodes/dom4/keycode_converter.h",
@@ skipping 168 matching lines @@
     "gesture_detection/filtered_gesture_provider.cc",
     "gesture_detection/filtered_gesture_provider.h",
     "gesture_detection/gesture_detection_export.h",
     "gesture_detection/gesture_detector.cc",
     "gesture_detection/gesture_detector.h",
     "gesture_detection/gesture_event_data.cc",
     "gesture_detection/gesture_event_data.h",
     "gesture_detection/gesture_event_data_packet.cc",
     "gesture_detection/gesture_event_data_packet.h",
     "gesture_detection/gesture_config_helper.h",
-    "gesture_detection/gesture_config_helper_aura.cc",
-    "gesture_detection/gesture_config_helper_android.cc",
     "gesture_detection/gesture_provider.cc",
     "gesture_detection/gesture_provider.h",
     "gesture_detection/motion_event.h",
     "gesture_detection/scale_gesture_detector.cc",
     "gesture_detection/scale_gesture_detector.h",
     "gesture_detection/snap_scroll_controller.cc",
     "gesture_detection/snap_scroll_controller.h",
     "gesture_detection/touch_disposition_gesture_filter.cc",
     "gesture_detection/touch_disposition_gesture_filter.h",
     "gesture_detection/velocity_tracker_state.cc",
     "gesture_detection/velocity_tracker_state.h",
     "gesture_detection/velocity_tracker.cc",
     "gesture_detection/velocity_tracker.h",
   ]
 
   deps = [
     ":events_base",
     "//base",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 
   defines = [ "GESTURE_DETECTION_IMPLEMENTATION" ]
 
   if (use_aura) {
     deps += [ ":events" ]
   }
 
-  if (!use_aura && !is_android) {
-    sources -= [ "gesture_detection/gesture_config_helper_aura.cc" ]
+  if (is_android) {
+    sources += [ "gesture_detection/gesture_config_helper_android.cc" ]
+  } else if (use_aura) {
+    sources += [ "gesture_detection/gesture_config_helper_aura.cc" ]
+  } else {
+    sources += [ "gesture_detection/gesture_config_helper.cc" ]
   }
 }
 
 source_set("events_test_support") {
   sources = [
     "test/cocoa_test_event_utils.h",
     "test/cocoa_test_event_utils.mm",
     "test/events_test_utils.cc",
     "test/events_test_utils.h",
     "test/events_test_utils_x11.cc",
@@ skipping 69 matching lines @@
     ":events_base",
     ":events_test_support",
     ":gesture_detection",
     "//base",
     "//base/test:run_all_unittests",
     "//skia",
     "//testing/gtest",
     "//ui/gfx:gfx_test_support",
   ]
 }