Fix windows classic scrollbar buttons.

ui/gfx/native_theme_win.cc

 // 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.
 
 #include "ui/gfx/native_theme_win.h"
 
 #include <windows.h>
 #include <uxtheme.h>
 #include <vsstyle.h>
 #include <vssym32.h>
@@ skipping 349 matching lines @@
     case kScrollbarRightArrow:
       classic_state = DFCS_SCROLLRIGHT;
       break;
     case kScrollbarUpArrow:
       classic_state = DFCS_SCROLLUP;
       break;
     default:
       NOTREACHED() << "Invalid part: " << part;
       break;
   }
-
+  switch(state) {
+    case kDisabled:
+      classic_state |= DFCS_INACTIVE;
+      break;
+    case kHovered:
+      classic_state |= DFCS_HOT;
+      break;
+    case kNormal:
+      break;
+    case kPressed:
+      classic_state |= DFCS_PUSHED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
   DrawFrameControl(hdc, &rect_win, DFC_SCROLL, classic_state);
   return S_OK;
 }
 
 HRESULT NativeThemeWin::PaintScrollbarTrack(
     SkCanvas* canvas,
     HDC hdc,
     Part part,
     State state,
     const gfx::Rect& rect,
@@ skipping 1272 matching lines @@
       }
       break;
     default:
       NOTREACHED() << "Invalid part: " << part;
       break;
   }
   return state_id;
 }
 
 }  // namespace gfx