Extract some account chooser views things for cross-platform use.

chrome/browser/ui/passwords/account_avatar_fetcher.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 CHROME_BROWSER_UI_PASSWORDS_ACCOUNT_AVATAR_FETCHER_H_
+#define CHROME_BROWSER_UI_PASSWORDS_ACCOUNT_AVATAR_FETCHER_H_
+
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/bitmap_fetcher/bitmap_fetcher.h"
+#include "url/gurl.h"
+
+namespace gfx {
+class ImageSkia;
+}  // namespace gfx
+
+namespace net {
+class URLRequestContextGetter;
+}  // namespace net
+
+class AccountAvatarFetcherDelegate {
+ public:
+  virtual void UpdateAvatar(const gfx::ImageSkia& image) = 0;
+};
+
+// Helper class to download an avatar. It deletes itself once the request is
+// done.
+class AccountAvatarFetcher : public chrome::BitmapFetcherDelegate {
+ public:
+  AccountAvatarFetcher(
+      const GURL& url,
+      const base::WeakPtr<AccountAvatarFetcherDelegate>& delegate);
+
+  void Start(net::URLRequestContextGetter* request_context);
+
+ private:
+  ~AccountAvatarFetcher() override;
+
+  // chrome::BitmapFetcherDelegate:
+  void OnFetchComplete(const GURL url, const SkBitmap* bitmap) override;
+
+  chrome::BitmapFetcher fetcher_;
+  base::WeakPtr<AccountAvatarFetcherDelegate> delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(AccountAvatarFetcher);
+};
+
+#endif  // CHROME_BROWSER_UI_PASSWORDS_ACCOUNT_AVATAR_FETCHER_H_