Distinguish between keystroke and character events.

ui/events/events_stub.cc

 // 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.
 
 #include "base/logging.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "ui/events/event_utils.h"
 #include "ui/gfx/point.h"
 #include "ui/gfx/vector2d.h"
@@ skipping 122 matching lines @@
 const char* CodeFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return "";
 }
 
 uint32 PlatformKeycodeFromNative(const base::NativeEvent& native_event) {
   NOTIMPLEMENTED();
   return 0;
 }
 
+bool IsCharFromNative(const base::NativeEvent& native_event) {
+  NOTIMPLEMENTED();
+  return false;
+}
+
 }  // namespace ui