Annotate more functions with _Printf_format_string_

components/drive/event_logger.h

 // Copyright (c) 2012 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_DRIVE_EVENT_LOGGER_H_
 #define COMPONENTS_DRIVE_EVENT_LOGGER_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 26 matching lines @@
   // Creates an event logger that keeps the latest kDefaultHistorySize events.
   EventLogger();
   ~EventLogger();
 
   // Logs a message and its severity.
   // Can be called from any thread as long as the object is alive.
   void LogRawString(logging::LogSeverity severity, const std::string& what);
 
   // Logs a message with formatting.
   // Can be called from any thread as long as the object is alive.
-  void Log(logging::LogSeverity severity, const char* format, ...)
-      PRINTF_FORMAT(3, 4);
+  void Log(logging::LogSeverity severity,
+           _Printf_format_string_ const char* format,
+           ...) PRINTF_FORMAT(3, 4);
 
   // Sets the history size. The existing history is cleared.
   // Can be called from any thread as long as the object is alive.
   void SetHistorySize(size_t history_size);
 
   // Gets the list of latest events (the oldest event comes first).
   // Can be called from any thread as long as the object is alive.
   std::vector<Event> GetHistory();
 
  private:
   std::deque<Event> history_;  // guarded by lock_.
   size_t history_size_;  // guarded by lock_.
   int next_event_id_;  // guarded by lock_.
   base::Lock lock_;
 
   DISALLOW_COPY_AND_ASSIGN(EventLogger);
 };
 
 }  // namespace drive
 
 #endif  // COMPONENTS_DRIVE_EVENT_LOGGER_H_