tabstrip: Use a PaintRecorder to access the Canvas for painting.

chrome/browser/ui/views/autofill/card_unmask_prompt_views.cc

 // Copyright 2014 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 "chrome/browser/ui/views/autofill/card_unmask_prompt_views.h"
 
 #include "base/basictypes.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/autofill/autofill_dialog_types.h"
 #include "chrome/browser/ui/autofill/card_unmask_prompt_controller.h"
@@ skipping 445 matching lines @@
 }
 
 CardUnmaskPromptViews::FadeOutView::FadeOutView()
     : fade_everything_(false), opacity_(1.0) {
 }
 CardUnmaskPromptViews::FadeOutView::~FadeOutView() {
 }
 
 void CardUnmaskPromptViews::FadeOutView::PaintChildren(
     const ui::PaintContext& context) {
-  if (opacity_ > 0.99)
-    return views::View::PaintChildren(context);
-
-  ui::CompositingRecorder recorder(context, opacity_);
+  uint8_t alpha = static_cast<uint8_t>(255 * opacity_);
+  ui::CompositingRecorder recorder(context, alpha);
   views::View::PaintChildren(context);
 }
 
 void CardUnmaskPromptViews::FadeOutView::OnPaint(gfx::Canvas* canvas) {
   if (!fade_everything_ || opacity_ > 0.99)
     return views::View::OnPaint(canvas);
 
   canvas->SaveLayerAlpha(0xff * opacity_);
   views::View::OnPaint(canvas);
   canvas->Restore();
 }
 
 void CardUnmaskPromptViews::FadeOutView::SetOpacity(double opacity) {
   opacity_ = opacity;
   SchedulePaint();
 }
 
 }  // namespace autofill