Add VectorIconButton functionality to ImageButton.

ui/views/controls/button/vector_icon_image_updater.h

+// Copyright 2017 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_VECTOR_ICON_IMAGE_UPDATER_H_
+#define UI_VIEWS_VECTOR_ICON_IMAGE_UPDATER_H_
+
+#include <memory>
+
+#include "base/macros.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "ui/gfx/vector_icon_types.h"
+#include "ui/views/view_observer.h"
+
+namespace ui {
+class NativeTheme;
+}
+
+namespace views {
+
+class ButtonListener;
+class ImageButton;
+class View;
+
+// TODO: comments in this file
+class VIEWS_EXPORT VectorIconImageUpdater : public ViewObserver {
+ public:
+  VectorIconImageUpdater(const gfx::VectorIcon& icon);
+
+  void Attach(ImageButton* owner_button);
+
+  void SetIcon(const gfx::VectorIcon& icon);
+
+ protected:
+  virtual SkColor GetVectorIconColor() const;
+
+ private:
+  // ViewObserver:
+  void OnThemeChanged(View* observed_view) override;
+  void OnNativeThemeChanged(View* observed_view,
+                            const ui::NativeTheme* theme) override;
+  void OnViewIsDeleting(View* observed_view) override;
+
+  void UpdateButtonImages();
+
+  ImageButton* owner_button_;
+  const gfx::VectorIcon* icon_;
+
+  DISALLOW_COPY_AND_ASSIGN(VectorIconImageUpdater);
+};
+
+VIEWS_EXPORT ImageButton* CreateImageButtonWithVectorIcon(
+    const gfx::VectorIcon& icon,
+    ButtonListener* listener);
+
+VIEWS_EXPORT ImageButton* CreateImageButtonWithImageUpdater(
+    VectorIconImageUpdater* updater,
+    ButtonListener* listener);
+
+}  // namespace views
+
+#endif  // UI_VIEWS_VECTOR_ICON_IMAGE_UPDATER_H_