Repurpose NotificationBitmapFetcher to BitmapFetcher

chrome/browser/bitmap_fetcher_delegate.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_BITMAP_FETCHER_DELEGATE_H_
+#define CHROME_BROWSER_BITMAP_FETCHER_DELEGATE_H_
+
+#include "url/gurl.h"
+
+class SkBitmap;
+
+namespace chrome {
+
+// A delegate interface for users of BitmapFetcher.
+class BitmapFetcherDelegate {
+ public:
+  BitmapFetcherDelegate() {}
+
+  // This will be called when the bitmap has been requested, whether or not the
+  // request succeeds.  |url| is the URL that was originally fetched so we can
+  // match up the bitmap with a specific request.  |bitmap| may be NULL if the
+  // image fails to be downloaded or decoded.
+  virtual void OnFetchComplete(const GURL url, const SkBitmap* bitmap) = 0;
+
+ protected:
+  virtual ~BitmapFetcherDelegate() {}
+
+  DISALLOW_COPY_AND_ASSIGN(BitmapFetcherDelegate);
+};
+
+}  // namespace chrome
+
+#endif  // CHROME_BROWSER_BITMAP_FETCHER_DELEGATE_H_