[Sync] Adding revisit logic for typed URLs.

components/sync_sessions/revisit/typed_url_page_revisit_observer.cc

Index: components/sync_sessions/revisit/typed_url_page_revisit_observer.cc
diff --git a/components/sync_sessions/revisit/typed_url_page_revisit_observer.cc b/components/sync_sessions/revisit/typed_url_page_revisit_observer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..159189577cee28a3691d82e8d9e7c03e44d4067c
--- /dev/null
+++ b/components/sync_sessions/revisit/typed_url_page_revisit_observer.cc
@@ -0,0 +1,30 @@
+// 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.
+
+#include "components/sync_sessions/revisit/typed_url_page_revisit_observer.h"
+
+#include "base/memory/scoped_ptr.h"
+#include "components/history/core/browser/history_service.h"
+#include "components/sync_sessions/revisit/typed_url_page_revisit_task.h"
+#include "url/gurl.h"
+
+namespace sync_sessions {
+
+TypedUrlPageRevisitObserver::TypedUrlPageRevisitObserver(
+    history::HistoryService* history)
+    : history_(base::AsWeakPtr(history)) {}
+
+TypedUrlPageRevisitObserver::~TypedUrlPageRevisitObserver() {}
+
+void TypedUrlPageRevisitObserver::OnPageVisit(
+    const GURL& url,
+    const PageVisitObserver::TransitionType transition) {
+  if (history_) {
+    history_->ScheduleDBTask(scoped_ptr<history::HistoryDBTask>(
+                                 new TypedUrlPageRevisitTask(url, transition)),
+                             &task_tracker_);
+  }
+}
+
+}  // namespace sync_sessions