Refactoring to make adding ink drop animations easier

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")
 import("//testing/test.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 100 matching lines @@
     "event_target_iterator.h",
     "event_targeter.h",
     "event_utils.cc",
     "event_utils.h",
     "events_export.h",
     "events_stub.cc",
     "gestures/gesture_recognizer_impl_mac.cc",
     "gestures/gesture_types.h",
     "null_event_targeter.cc",
     "null_event_targeter.h",
+    "scoped_target_handler.cc",
+    "scoped_target_handler.h",
     "win/events_win.cc",
     "win/system_event_state_lookup.cc",
     "win/system_event_state_lookup.h",
   ]
 
   defines = [ "EVENTS_IMPLEMENTATION" ]
 
   public_deps = [
     ":events_base",
   ]
@@ skipping 302 matching lines @@
     sources += [ "android/motion_event_android_unittest.cc" ]
   }
 }
 
 if (is_android) {
   generate_jar_jni("motionevent_jni_headers") {
     jni_package = "ui"
     classes = [ "android/view/MotionEvent.class" ]
   }
 }