Implements core logic for Pixel Canvas

ui/compositor/canvas_painter.cc

 // Copyright 2015 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/compositor/canvas_painter.h"
 
 #include "cc/paint/display_item_list.h"
 
 namespace ui {
 
 CanvasPainter::CanvasPainter(SkBitmap* output,
                              const gfx::Size& paint_size,
                              float raster_scale,
                              SkColor clear_color)
     : output_(output),
       paint_size_(paint_size),
       raster_scale_(raster_scale),
       clear_color_(clear_color),
       list_(new cc::DisplayItemList),
-      context_(list_.get(), raster_scale, gfx::Rect(paint_size_)) {}
+      context_(list_.get(), raster_scale, gfx::Rect(paint_size_), paint_size_) {
+}
 
 CanvasPainter::~CanvasPainter() {
   gfx::Size pixel_size = gfx::ScaleToCeiledSize(paint_size_, raster_scale_);
   SkImageInfo info = SkImageInfo::MakeN32(
       pixel_size.width(), pixel_size.height(), kPremul_SkAlphaType);
   if (!output_->tryAllocPixels(info))
     return;
 
   SkCanvas canvas(*output_);
   canvas.clear(clear_color_);
 
   canvas.scale(raster_scale_, raster_scale_);
 
   list_->Finalize();
   list_->Raster(&canvas, nullptr);
 }
 
 }  // namespace ui