Add ink drop masking to TrayBackgroundView

ui/views/animation/test/test_ink_drop.h

Index: ui/views/animation/test/test_ink_drop.h
diff --git a/ui/views/animation/test/test_ink_drop.h b/ui/views/animation/test/test_ink_drop.h
index c34b79b732a68e23cacba4d7a4efb79de7bfe442..ff881cdd180cd29eb58938e682e063d02a52f2a6 100644
--- a/ui/views/animation/test/test_ink_drop.h
+++ b/ui/views/animation/test/test_ink_drop.h
@@ -21,6 +21,7 @@ class TestInkDrop : public InkDrop {
 
   bool is_hovered() const { return is_hovered_; }
 
+  void UpdateLayerSize(const gfx::Size& layer_size) override;
   InkDropState GetTargetInkDropState() const override;
   void AnimateToState(InkDropState ink_drop_state) override;
   void SnapToActivated() override;