Refactoring to make adding ink drop animations easier

ui/views/animation/toolbar_ink_drop_delegate.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef UI_VIEWS_ANIMATION_TOOLBAR_INK_DROP_DELEGATE_H_
+#define UI_VIEWS_ANIMATION_TOOLBAR_INK_DROP_DELEGATE_H_
+
+#include "base/macros.h"
+#include "ui/views/animation/ink_drop_delegate.h"
+#include "ui/views/views_export.h"
+
+namespace ui {
+class GestureEvent;
+}  // namespace ui
+
+namespace views {
+
+class InkDropAnimationController;
+
+// .
+class VIEWS_EXPORT ToolbarInkDropDelegate : public InkDropDelegate {

[bruthig, 2015/11/06 20:29:11]

Am I correct to assume that you've only implemented a very concrete
ToolbarInkDropDelegate here for example purposes and the real proposal would be
to have some more general delegate implementation somewhere between the
ToolbarInkDropDelegate and the InkDropDelegate that would be re-usable?

[varkha, 2015/11/06 20:51:50]

Of course. I have only implemented a concrete part of a concrete delegate just
for illustration of wiring.

+ public:
+  ToolbarInkDropDelegate(
+      InkDropAnimationController* ink_drop_animation_controller_);
+  ~ToolbarInkDropDelegate() override;
+
+  // InkDropDelegate:
+  void OnGestureEvent(ui::GestureEvent* event) override;
+
+ private:
+  InkDropAnimationController* ink_drop_animation_controller_;
+
+  DISALLOW_COPY_AND_ASSIGN(ToolbarInkDropDelegate);
+};
+
+}  // namespace views
+
+#endif  // UI_VIEWS_ANIMATION_TOOLBAR_INK_DROP_DELEGATE_H_