Port HistoryService::GetVisibleVisitCountToHost to CancelableTaskTracker

chrome/browser/history/history_types.h

Index: chrome/browser/history/history_types.h
diff --git a/chrome/browser/history/history_types.h b/chrome/browser/history/history_types.h
index 8a4e3f6d9d6d64a573fedc1965c5c4bb40a2b996..b0923c4e83fccecc458217c4ea9316e3b07de7e4 100644
--- a/chrome/browser/history/history_types.h
+++ b/chrome/browser/history/history_types.h
@@ -286,7 +286,7 @@ struct QueryOptions {
 
 // QueryURLResult -------------------------------------------------------------
 
-// QueryURLResult encapsulate the result of a call to HistoryBackend::QueryURL.
+// QueryURLResult encapsulates the result of a call to HistoryBackend::QueryURL.
 struct QueryURLResult {
   QueryURLResult();
   ~QueryURLResult();
@@ -298,6 +298,19 @@ struct QueryURLResult {
   VisitVector visits;
 };
 
+// VisibleVisitCountToHostResult ----------------------------------------------
+
+// VisibleVisitCountToHostResult encapsulates the result of a call to
+// HistoryBackend::GetVisibleVisitCountToHost.
+struct VisibleVisitCountToHostResult {
+  // Indicates whether the call to HistoryBackend::GetVisibleVisitCountToHost
+  // was successfull or not. If false, then both |count| and |first_visit| are
+  // undefined.
+  bool success;
+  int count;
+  base::Time first_visit;
+};
+
 // MostVisitedURL --------------------------------------------------------------
 
 // Holds the per-URL information of the most visited query.