Sky should use an SkPicture when drawing

sky/compositor/BUILD.gn

 # 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.
 
 source_set("compositor") {
   sources = [
-    "display_delegate.cc",
-    "display_delegate.h",
-    "display_delegate_bitmap.cc",
-    "display_delegate_bitmap.h",
-    "display_delegate_ganesh.cc",
-    "display_delegate_ganesh.h",
     "layer.cc",
     "layer.h",
     "layer_client.cc",
     "layer_client.h",
     "layer_host.cc",
     "layer_host.h",
     "layer_host_client.cc",
     "layer_host_client.h",
+    "rasterizer.cc",
+    "rasterizer.h",
+    "rasterizer_bitmap.cc",
+    "rasterizer_bitmap.h",
+    "rasterizer_ganesh.cc",
+    "rasterizer_ganesh.h",
     "resource_manager.cc",
     "resource_manager.h",
     "surface_allocator.cc",
     "surface_allocator.h",
     "surface_holder.cc",
     "surface_holder.h",
   ]
 
   deps = [
     "//base",
     "//mojo/application",
     "//mojo/converters/geometry",
     "//mojo/converters/surfaces",
     "//mojo/gpu",
     "//mojo/public/c/gles2",
     "//mojo/public/cpp/bindings",
     "//mojo/public/cpp/environment",
     "//mojo/public/cpp/system",
     "//mojo/public/cpp/utility",
     "//mojo/public/interfaces/application",
     "//mojo/services/geometry/public/interfaces",
     "//mojo/services/surfaces/public/cpp",
     "//mojo/services/surfaces/public/interfaces",
     "//mojo/services/surfaces/public/interfaces:surface_id",
     "//mojo/skia",
     "//skia",
     "//ui/gfx/geometry",
   ]
 }