[Windows] Produce correct DomKey for NumPad when combined with Shift/NumLock

ui/events/keycodes/platform_key_map_win.h

 // Copyright (c) 2016 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_EVENTS_KEYCODES_PLATFORM_KEY_MAP_WIN_H_
 #define UI_EVENTS_KEYCODES_PLATFORM_KEY_MAP_WIN_H_
 
 #include <windows.h>
 
 #include <unordered_map>
 
 #include "base/hash.h"
 #include "ui/events/events_base_export.h"
 #include "ui/events/keycodes/dom/dom_key.h"
 #include "ui/events/keycodes/keyboard_codes_win.h"
 
 namespace ui {
 
 enum class DomCode;
 
 class EVENTS_BASE_EXPORT PlatformKeyMap {
  public:
   // Create and load key map table with specified keyboard layout.
   explicit PlatformKeyMap(HKL layout);
   ~PlatformKeyMap();
 
   // Returns the DomKey 'meaning' of |code| in the context of specified
   // |ui_event_flags| and stored keyboard layout.
+  // |key_code| will only be used for NumPad.
   DomKey DomCodeAndFlagsToDomKey(DomCode code,
+                                 KeyboardCode key_code,
                                  int ui_event_flags) const;
 
   // Returns the DomKey 'meaning' of |code| in the context of specified
   // |ui_event_flags| and the keyboard layout of current thread.
   // Updates a per-thread key map cache whenever the layout changes.
-  static DomKey DomCodeAndFlagsToDomKeyStatic(
-      DomCode code,
-      int ui_event_flags);
+  // |key_code| will only be used for NumPad.
+  static DomKey DomCodeAndFlagsToDomKeyStatic(DomCode code,
+                                              KeyboardCode key_code,
+                                              int ui_event_flags);

[chongz, 2016/03/10 00:59:10]

This interface looks ugly but I don't have a better solution...

 
  private:
   PlatformKeyMap();
 
   // TODO(chongz): Expose this function in response to WM_INPUTLANGCHANGE.
   void UpdateLayout(HKL layout);
 
   HKL keyboard_layout_ = 0;
 
   // TODO(chongz): Change type to DomCode when we got a generic pair hash class.
   typedef std::pair<int /*DomCode*/, int /*EventFlags*/> DomCodeEventFlagsPair;
   typedef std::unordered_map<DomCodeEventFlagsPair,
                              DomKey,
                              base::IntPairHash<std::pair<int, int>>>
       DomCodeToKeyMap;
   DomCodeToKeyMap code_to_key_;
 
   DISALLOW_COPY_AND_ASSIGN(PlatformKeyMap);
 };
 
 }  // namespace ui
 
 #endif  // UI_EVENTS_KEYCODES_PLATFORM_KEY_MAP_WIN_H_