Refactoring to make adding ink drop animations easier

ui/views/view.cc

Index: ui/views/view.cc
diff --git a/ui/views/view.cc b/ui/views/view.cc
index 0fc755972d6d57de055a7ea9d31fa11733eaf13b..ed60a9f2c6718c33c4d4cb1862f692178393644d 100644
--- a/ui/views/view.cc
+++ b/ui/views/view.cc
@@ -39,6 +39,7 @@
 #include "ui/gfx/transform.h"
 #include "ui/native_theme/native_theme.h"
 #include "ui/views/accessibility/native_view_accessibility.h"
+#include "ui/views/animation/ink_drop_delegate.h"
 #include "ui/views/background.h"
 #include "ui/views/border.h"
 #include "ui/views/context_menu_controller.h"
@@ -518,6 +519,10 @@ void View::Layout() {
       child->Layout();
     }
   }
+
+  InkDropDelegate* ink_drop_delegate = GetInkDropDelegate();
+  if (ink_drop_delegate)
+    ink_drop_delegate->OnLayout();
 }
 
 void View::InvalidateLayout() {
@@ -1254,6 +1259,9 @@ int View::OnPerformDrop(const ui::DropTargetEvent& event) {
 }
 
 void View::OnDragDone() {
+  InkDropDelegate* ink_drop_delegate = GetInkDropDelegate();
+  if (ink_drop_delegate)
+    ink_drop_delegate->OnAction(InkDropState::HIDDEN);
 }
 
 // static
@@ -1519,6 +1527,12 @@ void View::ReorderChildLayers(ui::Layer* parent_layer) {
   }
 }
 
+// Animations ----------------------------------------------------------------
+
+InkDropDelegate* View::GetInkDropDelegate() const {
+  return nullptr;
+}
+
 // Input -----------------------------------------------------------------------
 
 View::DragInfo* View::GetDragInfo() {