Popular sites on the NTP

chrome/browser/android/popular_sites.h

Index: chrome/browser/android/popular_sites.h
diff --git a/chrome/browser/android/popular_sites.h b/chrome/browser/android/popular_sites.h
new file mode 100644
index 0000000000000000000000000000000000000000..64f66ce6005e7da5230a5cf187fff58ad8df3346
--- /dev/null
+++ b/chrome/browser/android/popular_sites.h
@@ -0,0 +1,60 @@
+// Copyright 2015 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_POPULAR_SITES_H_
+#define CHROME_BROWSER_ANDROID_POPULAR_SITES_H_
+
+#include <vector>
+
+#include "base/callback.h"
+#include "base/macros.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/strings/string16.h"
+#include "url/gurl.h"
+
+namespace base {
+class FilePath;
+}
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+class FileDownloader;
+
+// Downloads and provides a list of suggested popular sites, for display on
+// the NTP when there are not enough personalized suggestions. Caches the
+// downloaded file on disk to avoid re-downloading on every startup.
+class PopularSites {
+ public:
+  struct Site {
+    Site(const base::string16& title, const GURL& url);
+
+    base::string16 title;
+    GURL url;
+  };
+
+  using FinishedCallback = base::Callback<void(bool /* success */)>;
+
+  PopularSites(net::URLRequestContextGetter* request_context,
+               const FinishedCallback& callback);
+  ~PopularSites();
+
+  const std::vector<Site>& sites() const { return sites_; }
+
+ private:
+  void OnDownloadDone(const base::FilePath& path, bool success);
+  void OnJsonParsed(scoped_ptr<std::vector<Site>> sites);
+
+  FinishedCallback callback_;
+  scoped_ptr<FileDownloader> downloader_;
+  std::vector<Site> sites_;
+
+  base::WeakPtrFactory<PopularSites> weak_ptr_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PopularSites);
+};
+
+#endif  // CHROME_BROWSER_ANDROID_POPULAR_SITES_H_