Make DispatchKeyEventPostIME() asynchronous.

ui/base/ime/BUILD.gn

 # Copyright 2015 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")
 
 source_set("text_input_types") {
   sources = [
     "text_input_flags.h",
@@ skipping 50 matching lines @@
     "ime_input_context_handler_interface.h",
     "infolist_entry.cc",
     "infolist_entry.h",
     "input_method.h",
     "input_method_auralinux.cc",
     "input_method_auralinux.h",
     "input_method_base.cc",
     "input_method_base.h",
     "input_method_chromeos.cc",
     "input_method_chromeos.h",
+    "input_method_delegate.cc",
     "input_method_delegate.h",
     "input_method_factory.cc",
     "input_method_factory.h",
     "input_method_initializer.cc",
     "input_method_initializer.h",
     "input_method_mac.h",
     "input_method_mac.mm",
     "input_method_minimal.cc",
     "input_method_minimal.h",
     "input_method_observer.h",
@@ skipping 122 matching lines @@
     libs = [ "AppKit.framework" ]
   }
 
   if (use_ozone) {
     deps += [
       "//ui/events/ozone:events_ozone_layout",
       "//ui/ozone",
     ]
   }
 }