Incorporating logging into Cast

media/cast/logging/logging_impl.h

 // Copyright 2013 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 MEDIA_CAST_LOGGING_LOGGING_IMPL_H_
 #define MEDIA_CAST_LOGGING_LOGGING_IMPL_H_
 
 // Generic class that handles event logging for the cast library.
 // Logging has three possible optional forms:
 // 1. Raw data and stats accessible by the application.
 // 2. UMA stats.
 // 3. Tracing of raw events.
 
+#include "base/memory/ref_counted.h"
+#include "base/task_runner.h"
 #include "media/cast/logging/logging_defines.h"
 #include "media/cast/logging/logging_raw.h"
 #include "media/cast/logging/logging_stats.h"
 
 namespace media {
 namespace cast {
 
-class LoggingImpl {
+// Should only be called from the main thread.
+class LoggingImpl : public base::NonThreadSafe {
  public:
   LoggingImpl(base::TickClock* clock,
+              scoped_refptr<base::TaskRunner> main_thread_proxy,
               bool enable_data_collection,
               bool enable_uma_stats,
               bool enable_tracing);
 
   ~LoggingImpl();
 
   void InsertFrameEvent(CastLoggingEvent event,
                         uint32 rtp_timestamp,
                         uint8 frame_id);
   void InsertFrameEventWithSize(CastLoggingEvent event,
                                 uint32 rtp_timestamp,
                                 uint8 frame_id,
                                 int frame_size);
   void InsertFrameEventWithDelay(CastLoggingEvent event,
                                  uint32 rtp_timestamp,
                                  uint8 frame_id,
                                  base::TimeDelta delay);
   void InsertPacketEvent(CastLoggingEvent event,
                          uint32 rtp_timestamp,
                          uint8 frame_id,
                          uint16 packet_id,
                          uint16 max_packet_id,
-                         int size);
+                         size_t size);
   void InsertGenericEvent(CastLoggingEvent event, int value);
 
   // Get raw data.
   FrameRawMap GetFrameRawData();
   PacketRawMap GetPacketRawData();
   GenericRawMap GetGenericRawData();
   // Get stats only (computed when called). Triggers UMA stats when enabled.
   const FrameStatsMap* GetFrameStatsData();
   const PacketStatsMap* GetPacketStatsData();
   const GenericStatsMap* GetGenericStatsData();
 
   void Reset();
 
  private:
+  scoped_refptr<base::TaskRunner> main_thread_proxy_;
   LoggingRaw raw_;
   LoggingStats stats_;
   bool enable_data_collection_;
   bool enable_uma_stats_;
   bool enable_tracing_;
 
   DISALLOW_COPY_AND_ASSIGN(LoggingImpl);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif  // MEDIA_CAST_LOGGING_LOGGING_IMPL_H_