Split HistoryClient in two objects

components/history/core/browser/history_backend_client.h

Index: components/history/core/browser/history_backend_client.h
diff --git a/components/history/core/browser/history_backend_client.h b/components/history/core/browser/history_backend_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..4ebc4966ecad247a8bd2d7244c84feed32804108
--- /dev/null
+++ b/components/history/core/browser/history_backend_client.h
@@ -0,0 +1,65 @@
+// 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 COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_CLIENT_H_
+#define COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_CLIENT_H_
+
+#include <vector>
+
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "url/gurl.h"
+
+namespace base {
+class FilePath;
+}
+
+namespace history {
+
+class HistoryBackend;
+class HistoryDatabase;
+class ThumbnailDatabase;
+
+struct URLAndTitle {
+  GURL url;
+  base::string16 title;
+};
+
+class HistoryBackendClient {
+ public:
+  HistoryBackendClient() {}
+  virtual ~HistoryBackendClient() {}
+
+  // Returns true if the specified URL is bookmarked.
+  virtual bool IsBookmarked(const GURL& url) = 0;
+
+  // Returns, by reference in |bookmarks|, the set of bookmarked URLs and their
+  // title. This returns the unique set of URLs. For example, if two bookmarks
+  // reference the same URL only one entry is added even if the title are not
+  // the same.
+  virtual void GetBookmarks(std::vector<URLAndTitle>* bookmarks) = 0;
+
+  // Returns whether database errors should be reported to the crash server.
+  virtual bool ShouldReportDatabaseError() = 0;
+
+#if defined(OS_ANDROID)
+  // Called upon initialization of the HistoryBackend.
+  virtual void OnHistoryBackendInitialized(
+      HistoryBackend* history_backend,
+      HistoryDatabase* history_database,
+      ThumbnailDatabase* thumbnail_database,
+      const base::FilePath& history_dir) = 0;
+
+  // Called upon destruction of the HistoryBackend.
+  virtual void OnHistoryBackendDestroyed(HistoryBackend* history_backend,
+                                         const base::FilePath& history_dir) = 0;
+#endif  // defined(OS_ANDROID)
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(HistoryBackendClient);
+};
+
+}  // namespace history
+
+#endif  // COMPONENTS_HISTORY_CORE_BROWSER_HISTORY_BACKEND_CLIENT_H_