[Sync] Adding revisit logic for typed URLs.

components/sync_sessions/revisit/typed_url_page_revisit_task.h

Index: components/sync_sessions/revisit/typed_url_page_revisit_task.h
diff --git a/components/sync_sessions/revisit/typed_url_page_revisit_task.h b/components/sync_sessions/revisit/typed_url_page_revisit_task.h
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index 0000000000000000000000000000000000000000..2851109f118f6836bc698cd7c029dc2e1d84d4ec
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+++ b/components/sync_sessions/revisit/typed_url_page_revisit_task.h
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+// 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_SYNC_SESSIONS_REVISIT_TYPED_URL_PAGE_REVISIT_TASK_H_
+#define COMPONENTS_SYNC_SESSIONS_REVISIT_TYPED_URL_PAGE_REVISIT_TASK_H_
+
+#include "base/gtest_prod_util.h"
+#include "components/history/core/browser/history_db_task.h"
+#include "components/history/core/browser/history_types.h"
+#include "components/sync_sessions/revisit/page_visit_observer.h"
+#include "url/gurl.h"
+
+namespace base {
+class Time;
+}  // namespace base
+
+namespace history {
+class HistoryBackend;
+class HistoryDatabase;
+}  // namespace history
+
+namespace sync_sessions {
+
+// This is the actual logic to check if the history database has a foreign,
+// synced, typed URL record for a given page/URL or not. This class implements
+// the HistoryDBTask interface with the assumption that is is being run by the
+// history mechanisms and on the correct thread.
+class TypedUrlPageRevisitTask : public history::HistoryDBTask {
+ public:
+  TypedUrlPageRevisitTask(const GURL& url,
+                          const PageVisitObserver::TransitionType transition);
+  ~TypedUrlPageRevisitTask() override;
+  bool RunOnDBThread(history::HistoryBackend* backend,
+                     history::HistoryDatabase* db) override;
+  void DoneRunOnMainThread() override;
+
+ private:
+  FRIEND_TEST_ALL_PREFIXES(TypedUrlPageRevisitTaskTest, MultipleMatches);
+
+  // Returns if there was a previously synced match. lastVisitTime is an out
+  // parameter. Its value is not read, but will be set if the return value is
+  // true.
+  bool FindLastSyncedMatchAge(history::HistoryBackend* backend,
+                              base::Time* lastVisitTime);
+
+  // Returns if there are visits and sources the instance url value, and
+  // populates the parameters repspectively. Virtual so that unit tests can
+  // override this functionality.
+  virtual bool FillVisitsAndSources(history::HistoryBackend* backend,
+                                    history::VisitVector* visits,
+                                    history::VisitSourceMap* sources);
+
+  const GURL url_;
+  const PageVisitObserver::TransitionType transition_;
+
+  DISALLOW_COPY_AND_ASSIGN(TypedUrlPageRevisitTask);
+};
+
+}  // namespace sync_sessions
+
+#endif  // COMPONENTS_SYNC_SESSIONS_REVISIT_TYPED_URL_PAGE_REVISIT_TASK_H_