Introduce ui::PaintRecorder and use it for CursorWindowDelegate.

ash/display/cursor_window_controller.cc

Index: ash/display/cursor_window_controller.cc
diff --git a/ash/display/cursor_window_controller.cc b/ash/display/cursor_window_controller.cc
index 77f51cc7317aa133d7b8b3d3ba274802516246ad..514e44d9d023ff0cf08f83dd8635d0a7720dc0ca 100644
--- a/ash/display/cursor_window_controller.cc
+++ b/ash/display/cursor_window_controller.cc
@@ -16,6 +16,7 @@
 #include "ui/base/hit_test.h"
 #include "ui/base/resource/resource_bundle.h"
 #include "ui/compositor/dip_util.h"
+#include "ui/compositor/paint_recorder.h"
 #include "ui/gfx/canvas.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/image/image_skia.h"
@@ -49,9 +50,10 @@ class CursorWindowDelegate : public aura::WindowDelegate {
   void OnCaptureLost() override {}
   void OnPaintToDisplayList(cc::DisplayItemList* list,
                             float device_scale_factor) override {
-    // TODO(danakj): Implement it. Does this need to be the same as
-    // View::OnPaintLayerToDisplayList? Can they share code?
-    NOTIMPLEMENTED();
+    gfx::Rect record_bounds(size_);
+    ui::PaintRecorder recorder(record_bounds, device_scale_factor);
+    OnPaint(recorder.canvas());
+    recorder.AppendDisplayItem(list);
   }
   void OnPaint(gfx::Canvas* canvas) override {
     canvas->DrawImageInt(cursor_image_, 0, 0);