[Suggestions] Make ThumbnailManager implement ImageManager

chrome/browser/search/suggestions/image_manager.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_SEARCH_SUGGESTIONS_IMAGE_MANAGER_H_
+#define CHROME_BROWSER_SEARCH_SUGGESTIONS_IMAGE_MANAGER_H_
+
+#include "base/basictypes.h"
+#include "base/callback.h"
+#include "chrome/browser/search/suggestions/proto/suggestions.pb.h"
+#include "ui/gfx/image/image_skia.h"
+#include "url/gurl.h"
+
+namespace suggestions {
+
+// An interface to retrieve images related to a specific URL.
+class ImageManager {
+ public:
+  ImageManager() {}
+  virtual ~ImageManager() {}
+
+  // (Re)Initializes states using data received from a SuggestionService. We're
+  // not doing this in the constructor because an instance may be long-lived.
+  virtual void Initialize(const SuggestionsProfile& suggestions) = 0;
+
+  // Retrieves stored image for website |url| asynchronously. Calls |callback|
+  // with Bitmap pointer if found, and NULL otherwise.
+  virtual void GetImageForURL(
+      const GURL& url,
+      base::Callback<void(const GURL&, const SkBitmap*)> callback) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ImageManager);
+};
+
+}  // namespace suggestions
+
+#endif  // CHROME_BROWSER_SEARCH_SUGGESTIONS_IMAGE_MANAGER_H_