Added support for animated/nonanimated user image.

chrome/browser/chromeos/login/user_image.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/chromeos/login/user_image.h"
+
+namespace chromeos {
+
+namespace {
+
+bool IsAnimatedImage(const UserImage::RawImage& data) {
+  const char kGIFStamp[] = "GIF";
+  const size_t kGIFStampLength = sizeof(kGIFStamp) - 1;
+
+  if (data.size() >= kGIFStampLength &&
+      memcmp(&data[0], kGIFStamp, kGIFStampLength) == 0) {
+    return true;
+  }
+  return false;
+}
+
+}  // namespace
+
+UserImage::UserImage(const SkBitmap& image)
+    : image_(image),
+      has_raw_image_(false),
+      has_animated_image_(false) {
+}
+
+UserImage::UserImage(const SkBitmap& image,
+                     const RawImage& raw_image)
+    : image_(image),
+      has_raw_image_(true),
+      has_animated_image_(IsAnimatedImage(raw_image)),
+      raw_image_(raw_image) {
+}
+
+UserImage::~UserImage() {}
+
+void UserImage::SetImage(const SkBitmap& image) {
+  image_ = image;
+  has_raw_image_ = false;
+  has_animated_image_ = false;
+  RawImage().swap(raw_image_);

[Ivan Korotkov, 2012/05/30 13:06:51]

As discussed offline, this idiom is OK but please add comment like "Clear
|raw_image_|."

[ygorshenin1, 2012/05/30 13:19:14]

Done.

+}
+
+}  // namespace chromeos