Implementing chrome://thumbnails page to view URLs in TopSites and cached thumbnails.

chrome/browser/ui/webui/ntp/thumbnail_list_source.h

Index: chrome/browser/ui/webui/ntp/thumbnail_list_source.h
diff --git a/chrome/browser/ui/webui/ntp/thumbnail_source.h b/chrome/browser/ui/webui/ntp/thumbnail_list_source.h
similarity index 51%
copy from chrome/browser/ui/webui/ntp/thumbnail_source.h
copy to chrome/browser/ui/webui/ntp/thumbnail_list_source.h
index f4ff8f014388f4cc9752889265219f08650ed7c4..2134818e63b28a0a3614d7852acbdad104dfaefd 100644
--- a/chrome/browser/ui/webui/ntp/thumbnail_source.h
+++ b/chrome/browser/ui/webui/ntp/thumbnail_list_source.h
@@ -1,64 +1,67 @@
-// Copyright (c) 2012 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_WEBUI_NTP_THUMBNAIL_SOURCE_H_
-#define CHROME_BROWSER_UI_WEBUI_NTP_THUMBNAIL_SOURCE_H_
-
-#include <string>
-
-#include "base/basictypes.h"
-#include "base/memory/ref_counted.h"
-#include "content/public/browser/url_data_source.h"
-
-class Profile;
-
-namespace base {
-class RefCountedMemory;
-}
-
-namespace thumbnails {
-class ThumbnailService;
-}
-
-// ThumbnailSource is the gateway between network-level chrome: requests for
-// thumbnails and the history/top-sites backend that serves these.
-class ThumbnailSource : public content::URLDataSource {
- public:
-  ThumbnailSource(Profile* profile, bool prefix_match);
-
-  // content::URLDataSource implementation.
-  virtual std::string GetSource() const OVERRIDE;
-  virtual void StartDataRequest(
-      const std::string& path,
-      int render_process_id,
-      int render_view_id,
-      const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
-  virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
-  virtual base::MessageLoop* MessageLoopForRequestPath(
-      const std::string& path) const OVERRIDE;
-  virtual bool ShouldServiceRequest(
-      const net::URLRequest* request) const OVERRIDE;
-
- private:
-  virtual ~ThumbnailSource();
-
-  // Raw PNG representation of the thumbnail to show when the thumbnail
-  // database doesn't have a thumbnail for a webpage.
-  scoped_refptr<base::RefCountedMemory> default_thumbnail_;
-
-  // ThumbnailService.
-  scoped_refptr<thumbnails::ThumbnailService> thumbnail_service_;
-
-  // Only used when servicing requests on the UI thread.
-  Profile* const profile_;
-
-  // If an exact thumbnail URL match fails, specifies whether or not to try
-  // harder by matching the query thumbnail URL as URL prefix. This affects
-  // GetSource().
-  const bool prefix_match_;
-
-  DISALLOW_COPY_AND_ASSIGN(ThumbnailSource);
-};
-
-#endif  // CHROME_BROWSER_UI_WEBUI_NTP_THUMBNAIL_SOURCE_H_
+// Copyright (c) 2013 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_WEBUI_NTP_THUMBNAIL_LIST_SOURCE_H_
+#define CHROME_BROWSER_UI_WEBUI_NTP_THUMBNAIL_LIST_SOURCE_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/weak_ptr.h"
+#include "chrome/browser/history/history_types.h"
+#include "content/public/browser/url_data_source.h"
+
+class Profile;
+
+namespace base {
+class RefCountedMemory;
+}
+
+namespace thumbnails {
+class ThumbnailService;
+}
+
+// ThumbnailListSource renders a webpage to list all thumbnails stored in
+// TopSites, along with all associated URLs. The thumbnail images are embedded
+// into the HTML via Base64, so we can easily produce a dump of TopSites and
+// the thumbnails it stores.
+class ThumbnailListSource : public content::URLDataSource {
+ public:
+  explicit ThumbnailListSource(Profile* profile);
+
+  // content::URLDataSource implementation.
+  virtual std::string GetSource() const OVERRIDE;
+  virtual void StartDataRequest(
+      const std::string& path,
+      int render_process_id,
+      int render_view_id,
+      const content::URLDataSource::GotDataCallback& callback) OVERRIDE;
+  virtual std::string GetMimeType(const std::string& path) const OVERRIDE;
+  virtual base::MessageLoop* MessageLoopForRequestPath(
+      const std::string& path) const OVERRIDE;
+  virtual bool ShouldServiceRequest(
+      const net::URLRequest* request) const OVERRIDE;
+
+ private:
+  virtual ~ThumbnailListSource();
+
+  void OnMostVisitedURLsAvailable(
+    const content::URLDataSource::GotDataCallback& callback,
+    const history::MostVisitedURLList& mvurl_list);
+
+  // ThumbnailService.
+  scoped_refptr<thumbnails::ThumbnailService> thumbnail_service_;
+
+  // Only used when servicing requests on the UI thread.
+  Profile* const profile_;
+
+  // For callbacks may be run after destruction.
+  base::WeakPtrFactory<ThumbnailListSource> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(ThumbnailListSource);
+};
+
+
+#endif  // CHROME_BROWSER_UI_WEBUI_NTP_THUMBNAIL_LIST_SOURCE_H_