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

ui/views/bubble/tray_bubble_view.cc

Index: ui/views/bubble/tray_bubble_view.cc
diff --git a/ui/views/bubble/tray_bubble_view.cc b/ui/views/bubble/tray_bubble_view.cc
index cf867d141f72c864438d6b7715ca88c05f05ca9d..81c19f5110f41f10463975f1fe170a468ddf93a1 100644
--- a/ui/views/bubble/tray_bubble_view.cc
+++ b/ui/views/bubble/tray_bubble_view.cc
@@ -15,7 +15,7 @@
 #include "ui/aura/window.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_delegate.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/geometry/insets.h"
@@ -206,11 +206,12 @@ TrayBubbleContentMask::~TrayBubbleContentMask() {
 }
 
 void TrayBubbleContentMask::OnPaintLayer(const ui::PaintContext& context) {
+  ui::PaintRecorder recorder(context);
   SkPaint paint;
   paint.setAlpha(255);
   paint.setStyle(SkPaint::kFill_Style);
   gfx::Rect rect(layer()->bounds().size());
-  context.canvas()->DrawRoundRect(rect, corner_radius_, paint);
+  recorder.canvas()->DrawRoundRect(rect, corner_radius_, paint);
 }
 
 void TrayBubbleContentMask::OnDeviceScaleFactorChanged(