Animate the script badges.

chrome/browser/extensions/location_bar_controller.cc

+// Copyright (c) 2012 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 "chrome/browser/extensions/location_bar_controller.h"
+
+#include "base/compiler_specific.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkDevice.h"
+#include "third_party/skia/include/core/SkPaint.h"
+#include "ui/base/animation/animation.h"
+#include "ui/base/animation/animation_delegate.h"
+
+namespace extensions {
+
+LocationBarController::IconAnimation::IconAnimation(
+    LocationBarController* owner,
+    ui::AnimationDelegate* delegate)
+    // 100ms animation at 50fps (so 5 animation frames in total).
+    : ui::LinearAnimation(100, 50, delegate),
+      owner_(owner) {}
+
+LocationBarController::IconAnimation::~IconAnimation() {}
+
+const SkBitmap& LocationBarController::IconAnimation::Apply(
+    const SkBitmap& icon) const {
+  DCHECK_GT(icon.width(), 0);
+  DCHECK_GT(icon.height(), 0);
+
+  if (!device_.get() ||
+      (device_->width() != icon.width()) ||
+      (device_->height() != icon.height())) {
+    device_.reset(new SkDevice(
+      SkBitmap::kARGB_8888_Config, icon.width(), icon.height(), true));
+  }
+
+  SkCanvas canvas(device_.get());
+  canvas.clear(SK_ColorWHITE);
+  SkPaint paint;
+  paint.setAlpha(CurrentValueBetween(0, 255));
+  canvas.drawBitmap(icon, 0, 0, &paint);
+  return device_->accessBitmap(false);
+}
+
+void LocationBarController::IconAnimation::AddObserver(
+    LocationBarController::IconAnimation::Observer* observer) {
+  observers_.AddObserver(observer);
+}
+
+void LocationBarController::IconAnimation::RemoveObserver(
+    LocationBarController::IconAnimation::Observer* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+void LocationBarController::IconAnimation::AnimateToState(double state) {
+  FOR_EACH_OBSERVER(Observer,
+                    observers_,
+                    OnIconChanged(*this, owner_));
+}
+
+}  // namespace extensions