No need to kClear_Mode a layer right after its created, as that will automatically

ui/views/controls/button/text_button.cc

 // 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.
 
 #include "ui/views/controls/button/text_button.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 #include "grit/ui_resources.h"
@@ skipping 120 matching lines @@
   const BorderImageSet* set = &normal_set_;
   if (button->show_multiple_icon_states() &&
       ((state == TextButton::BS_HOT) || (state == TextButton::BS_PUSHED)))
     set = (state == TextButton::BS_HOT) ? &hot_set_ : &pushed_set_;
   if (set->top_left) {
     if (button->GetAnimation()->is_animating()) {
       // TODO(pkasting): Really this should crossfade between states so it could
       // handle the case of having a non-NULL |normal_set_|.
       canvas->SaveLayerAlpha(static_cast<uint8>(
           button->GetAnimation()->CurrentValueBetween(0, 255)));
-      canvas->sk_canvas()->drawARGB(0, 255, 255, 255, SkXfermode::kClear_Mode);
       Paint(view, canvas, *set);
       canvas->Restore();
     } else {
       Paint(view, canvas, *set);
     }
   }
 }
 
 void TextButtonBorder::Paint(const View& view,
                              gfx::Canvas* canvas,
@@ skipping 716 matching lines @@
   // Windows may paint a dotted focus rect in
   // NativeTextButton::OnPaintFocusBorder. To avoid getting two focus
   // indications (A dotted rect and a highlighted border) only set is_focused on
   // non windows platforms.
   params->button.is_focused = HasFocus() &&
       (focusable() || IsAccessibilityFocusable());
 #endif
 }
 
 }  // namespace views