Remove uses of skia::ReadPixels(PaintCanvas)

ui/gfx/canvas.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/gfx/canvas.h"
 
 #include <cmath>
 #include <limits>
 
 #include "base/i18n/rtl.h"
@@ skipping 527 matching lines @@
   flags->setShader(CreateImageRepShader(image_rep, SkShader::kRepeat_TileMode,
                                         shader_scale));
   flags->setBlendMode(SkBlendMode::kSrcOver);
   return true;
 }
 
 void Canvas::Transform(const gfx::Transform& transform) {
   canvas_->concat(transform.matrix());
 }
 
+SkBitmap Canvas::ToBitmap() {
+  SkBitmap bitmap;
+  bitmap.setInfo(canvas_->imageInfo());
+  canvas_->readPixels(&bitmap, 0, 0);
+  return bitmap;
+}
+
 bool Canvas::IntersectsClipRect(const SkRect& rect) {
   SkRect clip;
   return canvas_->getLocalClipBounds(&clip) && clip.intersects(rect);
 }
 
 void Canvas::DrawImageIntHelper(const ImageSkiaRep& image_rep,
                                 int src_x,
                                 int src_y,
                                 int src_w,
                                 int src_h,
@@ skipping 35 matching lines @@
   flags.setFilterQuality(filter ? kLow_SkFilterQuality : kNone_SkFilterQuality);
   flags.setShader(CreateImageRepShaderForScale(
       image_rep, SkShader::kRepeat_TileMode, shader_scale,
       remove_image_scale ? image_rep.scale() : 1.f));
 
   // The rect will be filled by the bitmap.
   canvas_->drawRect(dest_rect, flags);
 }
 
 }  // namespace gfx