Use animated vector icon for app menu notification animation.

ui/views/controls/animated_icon_view.cc

+// 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.
+
+#include "ui/views/controls/animated_icon_view.h"
+
+#include "ui/compositor/compositor.h"
+#include "ui/gfx/canvas.h"
+#include "ui/gfx/color_palette.h"
+#include "ui/gfx/paint_vector_icon.h"
+#include "ui/views/widget/widget.h"
+
+namespace views {
+
+AnimatedIconView::AnimatedIconView(const gfx::VectorIcon& icon)
+    : icon_(icon),
+      color_(gfx::kPlaceholderColor),
+      duration_(gfx::GetDurationOfAnimation(icon)) {
+  UpdateStaticImage();
+}
+
+AnimatedIconView::~AnimatedIconView() {}
+
+void AnimatedIconView::Animate(State target) {
+  SetState(target);
+  if (!IsAnimating())
+    GetWidget()->GetCompositor()->AddAnimationObserver(this);
+  start_time_ = base::TimeTicks::Now();
+}
+
+void AnimatedIconView::SetState(State state) {
+  state_ = state;
+  UpdateStaticImage();
+}
+
+void AnimatedIconView::OnPaint(gfx::Canvas* canvas) {
+  if (!IsAnimating()) {
+    views::ImageView::OnPaint(canvas);
+    return;
+  }
+
+  auto timestamp = base::TimeTicks::Now();
+  base::TimeDelta elapsed = timestamp - start_time_;
+  if (state_ == END)
+    elapsed = start_time_ + duration_ - timestamp;
+
+  canvas->Translate(GetImageBounds().OffsetFromOrigin());
+  gfx::PaintVectorIcon(canvas, icon_, color_, elapsed);
+}
+
+void AnimatedIconView::OnAnimationStep(base::TimeTicks timestamp) {
+  base::TimeDelta elapsed = timestamp - start_time_;
+  if (elapsed > duration_) {
+    GetWidget()->GetCompositor()->RemoveAnimationObserver(this);
+    start_time_ = base::TimeTicks();
+  }
+
+  SchedulePaint();
+}
+
+void AnimatedIconView::OnCompositingShuttingDown(ui::Compositor* compositor) {}
+
+bool AnimatedIconView::IsAnimating() {
+  return start_time_ != base::TimeTicks();
+}
+
+void AnimatedIconView::UpdateStaticImage() {
+  gfx::IconDescription description(
+      icon_, 0, color_, state_ == START ? base::TimeDelta() : duration_,
+      gfx::kNoneIcon);
+  SetImage(gfx::CreateVectorIcon(description));
+}
+
+}  // namespace views