ui: Use a PaintRecorder to access the Canvas for painting.

ui/aura/bench/bench_main.cc

Index: ui/aura/bench/bench_main.cc
diff --git a/ui/aura/bench/bench_main.cc b/ui/aura/bench/bench_main.cc
index 2df5e886340d1e6869b48b078e30424a2966d5cb..ce0993fecc837c20d817501d134c8af7faf35ada 100644
--- a/ui/aura/bench/bench_main.cc
+++ b/ui/aura/bench/bench_main.cc
@@ -29,7 +29,7 @@
 #include "ui/compositor/compositor_observer.h"
 #include "ui/compositor/debug_utils.h"
 #include "ui/compositor/layer.h"
-#include "ui/compositor/paint_context.h"
+#include "ui/compositor/paint_recorder.h"
 #include "ui/compositor/test/in_process_context_factory.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/geometry/rect.h"
@@ -63,7 +63,8 @@ class ColoredLayer : public Layer, public LayerDelegate {
   // Overridden from LayerDelegate:
   void OnPaintLayer(const ui::PaintContext& context) override {
     if (draw_) {
-      context.canvas()->DrawColor(color_);
+      ui::PaintRecorder recorder(context);
+      recorder.canvas()->DrawColor(color_);
     }
   }