Fix the Windows implementation of EventGenerator::PressKey().

ui/aura/test/event_generator.h

 // Copyright (c) 2011 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.
 
 #ifndef UI_AURA_TEST_EVENT_GENERATOR_H_
 #define UI_AURA_TEST_EVENT_GENERATOR_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "ui/base/keycodes/keyboard_codes.h"
@@ skipping 76 matching lines @@
 
   void PressMoveAndReleaseTouchBy(int x, int y) {
     PressMoveAndReleaseTouchTo(current_location_.Add(gfx::Point(x, y)));
   }
 
   // Generates press, move and release events to move touch
   // to the center of the window.
   void PressMoveAndReleaseTouchToCenterOf(Window* window);
 
   // Generates a key press event. On platforms except Windows and X11, a key
-  // event without native_event() is generated.
+  // event without native_event() is generated. Note that ui::EF_ flags should
+  // be passed as |flags|, not the native ones like 'ShiftMask' in <X11/X.h>.
   // TODO(yusukes): Support native_event() on all platforms.
   void PressKey(ui::KeyboardCode key_code, int flags);
 
   // Generates a key release event. On platforms except Windows and X11, a key
-  // event without native_event() is generated.
+  // event without native_event() is generated. Note that ui::EF_ flags should
+  // be passed as |flags|, not the native ones like 'ShiftMask' in <X11/X.h>.
   // TODO(yusukes): Support native_event() on all platforms.
   void ReleaseKey(ui::KeyboardCode key_code, int flags);
 
  private:
   // Dispatch the |event| to the RootWindow.
   void Dispatch(Event& event);
   // Dispatch a key event to the RootWindow.
   void DispatchKeyEvent(bool is_press, ui::KeyboardCode key_code, int flags);
 
   int flags_;
   gfx::Point current_location_;
 
   DISALLOW_COPY_AND_ASSIGN(EventGenerator);
 };
 
 }  // namespace test
 }  // namespace aura
 
 #endif  // UI_AURA_TEST_EVENT_GENERATOR_H_