Show Captcha dialog.

chrome/browser/chromeos/login/image_downloader.h

Index: chrome/browser/chromeos/login/image_downloader.h
diff --git a/chrome/browser/chromeos/login/image_downloader.h b/chrome/browser/chromeos/login/image_downloader.h
new file mode 100644
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+// Copyright (c) 2010 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_CHROMEOS_LOGIN_IMAGE_DOWNLOADER_H_
+#define CHROME_BROWSER_CHROMEOS_LOGIN_IMAGE_DOWNLOADER_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/scoped_ptr.h"
+#include "chrome/browser/chromeos/login/image_decoder.h"
+#include "chrome/common/net/url_fetcher.h"
+#include "googleurl/src/gurl.h"
+
+namespace chromeos {
+
+// Downloads the image, decodes it in a sandboxed process.
+// This objects deletes itself after OnURLFetchComplete.
+class ImageDownloader : public URLFetcher::Delegate {
+ public:
+  // Starts downloading the picture. Optional auth_token could be passed.
+  // Object is deleted as reference counted object.
+  ImageDownloader(ImageDecoder::Delegate* delegate,
+                  const GURL& image_url,
+                  const std::string& auth_token);
+  virtual ~ImageDownloader() {}
+
+ private:
+  // Overriden from URLFetcher::Delegate:
+  virtual void OnURLFetchComplete(const URLFetcher* source,
+                                  const GURL& url,
+                                  const URLRequestStatus& status,
+                                  int response_code,
+                                  const ResponseCookies& cookies,
+                                  const std::string& data);
+
+  ImageDecoder::Delegate* delegate_;
+  scoped_ptr<URLFetcher> image_fetcher_;
+
+  DISALLOW_COPY_AND_ASSIGN(ImageDownloader);
+};
+
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_LOGIN_IMAGE_DOWNLOADER_H_