Implements core logic for Pixel Canvas

ui/compositor/canvas_painter.cc

Index: ui/compositor/canvas_painter.cc
diff --git a/ui/compositor/canvas_painter.cc b/ui/compositor/canvas_painter.cc
index a12e85ab06efe118dfddcef8d0cac1ca04b90f4a..864d8b03e84c1b9b980486687d0138a5baf344bb 100644
--- a/ui/compositor/canvas_painter.cc
+++ b/ui/compositor/canvas_painter.cc
@@ -11,13 +11,17 @@ namespace ui {
 CanvasPainter::CanvasPainter(SkBitmap* output,
                              const gfx::Size& paint_size,
                              float raster_scale,
-                             SkColor clear_color)
+                             SkColor clear_color,
+                             bool is_pixel_canvas)
     : 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_),
+               is_pixel_canvas) {}
 
 CanvasPainter::~CanvasPainter() {
   gfx::Size pixel_size = gfx::ScaleToCeiledSize(paint_size_, raster_scale_);