Repurpose NotificationBitmapFetcher to BitmapFetcher

chrome/browser/android/banners/app_banner_icon_fetcher.h

+// Copyright 2014 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_ANDROID_BANNERS_APP_BANNER_ICON_FETCHER_H_
+#define CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_ICON_FETCHER_H_
+
+#include <string>
+
+#include "chrome/browser/image_decoder.h"
+#include "net/url_request/url_fetcher_delegate.h"
+#include "url/gurl.h"
+
+namespace content {
+class WebContents;
+}  // namespace content
+
+namespace net {
+class URLFetcher;
+}  // namespace net
+
+// Retrieves an icon from the given URL.
+class AppBannerIconFetcher : public ImageDecoder::Delegate,
+                             public net::URLFetcherDelegate {
+ public:
+  class Delegate {
+   public:
+    // Called when the image has been fetched successfully.
+    virtual void OnIconFetchSuccessful(const GURL& image_url,
+                                       const SkBitmap& image) = 0;
+
+    // Called when the image fetch has failed.
+    virtual void OnIconFetchFailed(const GURL& image_url) = 0;
+  };
+
+  // Kicks off retrieval of the given image stored at |image_url|.
+  // The |delegate| is informed when the icon fetch has finished.
+  AppBannerIconFetcher(Delegate* delegate,
+                       content::WebContents* web_contents,
+                       const GURL& image_url);
+
+  virtual ~AppBannerIconFetcher();
+
+  // net::URLFetcherDelegate overrides.
+  virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
+
+  // ImageDecoder::Delegate overrides.
+  virtual void OnImageDecoded(const ImageDecoder* decoder,
+                              const SkBitmap& decoded_image) OVERRIDE;
+
+  virtual void OnDecodeImageFailed(const ImageDecoder* decoder) OVERRIDE;
+
+ private:
+  // Alert the delegate that retrieval has failed for some reason.
+  void AlertDelegateAboutFailure();
+
+  Delegate* delegate_;
+  scoped_ptr<net::URLFetcher> fetcher_;
+  const GURL image_url_;
+
+  DISALLOW_COPY_AND_ASSIGN(AppBannerIconFetcher);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_BANNERS_APP_BANNER_ICON_FETCHER_H_