views: Access the Canvas through recorders not through PaintContext.

ui/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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("compositor") {
   sources = [
     "clip_transform_recorder.cc",
     "clip_transform_recorder.h",
     "closure_animation_observer.cc",
     "closure_animation_observer.h",
+    "compositing_recorder.cc",
+    "compositing_recorder.h",
     "compositor.cc",
     "compositor.h",
     "compositor_animation_observer.h",
     "compositor_export.h",
     "compositor_observer.h",
     "compositor_switches.cc",
     "compositor_switches.h",
     "compositor_vsync_manager.cc",
     "compositor_vsync_manager.h",
     "debug_utils.cc",
@@ skipping 151 matching lines @@
       "//ui/gfx/geometry",
       "//ui/gl",
       "//ui/resources",
     ]
 
     if (is_linux) {
       deps += [ "//third_party/mesa:osmesa" ]
     }
   }
 }