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

ui/aura/test/test_window_delegate.cc

Index: ui/aura/test/test_window_delegate.cc
diff --git a/ui/aura/test/test_window_delegate.cc b/ui/aura/test/test_window_delegate.cc
index 89918caa4cad79974bac5642db5d60d0e47f8327..4b0f8b77a03ded1928c71e9ca7bac16e1e2daca2 100644
--- a/ui/aura/test/test_window_delegate.cc
+++ b/ui/aura/test/test_window_delegate.cc
@@ -7,7 +7,7 @@
 #include "base/strings/stringprintf.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
-#include "ui/compositor/paint_context.h"
+#include "ui/compositor/paint_recorder.h"
 #include "ui/events/event.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/path.h"
@@ -122,7 +122,8 @@ void ColorTestWindowDelegate::OnWindowDestroyed(Window* window) {
 }
 
 void ColorTestWindowDelegate::OnPaint(const ui::PaintContext& context) {
-  context.canvas()->DrawColor(color_, SkXfermode::kSrc_Mode);
+  ui::PaintRecorder recorder(context);
+  recorder.canvas()->DrawColor(color_, SkXfermode::kSrc_Mode);
 }
 
 ////////////////////////////////////////////////////////////////////////////////