views: refactor away PlatformStyle::BackgroundColorForMdButton

ui/native_theme/native_theme.h

 // Copyright (c) 2012 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_NATIVE_THEME_NATIVE_THEME_H_
 #define UI_NATIVE_THEME_NATIVE_THEME_H_
 
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "build/build_config.h"
@@ skipping 241 matching lines @@
     // FocusableBorder
     kColorId_FocusedBorderColor,
     kColorId_UnfocusedBorderColor,
     // Button
     kColorId_ButtonBackgroundColor,
     kColorId_ButtonEnabledColor,
     kColorId_ButtonDisabledColor,
     kColorId_ButtonHighlightColor,
     kColorId_ButtonHoverColor,
     kColorId_ButtonHoverBackgroundColor,
+    kColorId_ButtonPressedShade,
     kColorId_BlueButtonEnabledColor,
     kColorId_BlueButtonDisabledColor,
     kColorId_BlueButtonPressedColor,
     kColorId_BlueButtonHoverColor,
     kColorId_BlueButtonShadowColor,
     kColorId_CallToActionColor,
     kColorId_TextOnCallToActionColor,
     // MenuItem
     kColorId_EnabledMenuItemForegroundColor,
     kColorId_DisabledMenuItemForegroundColor,
@@ skipping 107 matching lines @@
  private:
   // Observers to notify when the native theme changes.
   base::ObserverList<NativeThemeObserver> native_theme_observers_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeTheme);
 };
 
 }  // namespace ui
 
 #endif  // UI_NATIVE_THEME_NATIVE_THEME_H_