Use skia::ReadPixels() in ui::NativeThemeWin

ui/native_theme/native_theme_win.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/native_theme/native_theme_win.h"
 
 #include <windows.h>
 #include <stddef.h>
 #include <uxtheme.h>
 #include <vsstyle.h>
@@ skipping 702 matching lines @@
     case kScrollbarVerticalTrack:
       adjusted_extra.scrollbar_track.track_x = 0;
       adjusted_extra.scrollbar_track.track_y = 0;
       break;
     default:
       break;
   }
   // Draw the theme controls using existing HDC-drawing code.
   PaintDirect(&offscreen_canvas, part, state, adjusted_rect, adjusted_extra);
 
-  // Copy the pixels to a bitmap that has ref-counted pixel storage, which is
-  // necessary to have when drawing to a SkPicture.
-  const SkBitmap& hdc_bitmap =
-      offscreen_canvas.getDevice()->accessBitmap(false);
-  SkBitmap bitmap;
-  hdc_bitmap.copyTo(&bitmap, kN32_SkColorType);
+  SkBitmap bitmap = skia::ReadPixels(&offscreen_canvas);
 
   // Post-process the pixels to fix up the alpha values (see big comment above).
   const SkPMColor placeholder_value = SkPreMultiplyColor(placeholder);
   const int pixel_count = rect.width() * rect.height();
   SkPMColor* pixels = bitmap.getAddr32(0, 0);
   for (int i = 0; i < pixel_count; i++) {
     if (pixels[i] == placeholder_value) {
       // Pixel wasn't touched - make it fully transparent.
       pixels[i] = SkPackARGB32(0, 0, 0, 0);
     } else if (SkGetPackedA32(pixels[i]) == 0) {
@@ skipping 1349 matching lines @@
     break;
   case LAST:
     NOTREACHED();
     break;
   }
   theme_handles_[theme_name] = handle;
   return handle;
 }
 
 }  // namespace ui