Cleanup BWE SendTimeHistory class

webrtc/modules/remote_bitrate_estimator/include/send_time_history.h

Index: webrtc/modules/remote_bitrate_estimator/include/send_time_history.h
diff --git a/webrtc/modules/remote_bitrate_estimator/include/send_time_history.h b/webrtc/modules/remote_bitrate_estimator/include/send_time_history.h
index f59790b4a544de02ee6dfc5c8f7d2174e56008c8..194899219dddc10ae72ae242d2642b381046d027 100644
--- a/webrtc/modules/remote_bitrate_estimator/include/send_time_history.h
+++ b/webrtc/modules/remote_bitrate_estimator/include/send_time_history.h
@@ -13,37 +13,44 @@
 
 #include <map>
 
-#include "webrtc/base/constructormagic.h"
 #include "webrtc/base/basictypes.h"
-#include "webrtc/modules/remote_bitrate_estimator/include/remote_bitrate_estimator.h"
+#include "webrtc/base/constructormagic.h"
 
 namespace webrtc {
+class Clock;
+struct PacketInfo;
 
 class SendTimeHistory {
  public:
-  SendTimeHistory(Clock* clock, int64_t packet_age_limit);
-  virtual ~SendTimeHistory();
+  SendTimeHistory(Clock* clock, int64_t packet_age_limit_ms);
+  ~SendTimeHistory();
+
+  void Clear();
 
+  // Cleanup old entries, then add new packet info with provided parameters.
   void AddAndRemoveOld(uint16_t sequence_number,
-                       size_t length,
+                       size_t payload_size,
                        int probe_cluster_id);
-  bool OnSentPacket(uint16_t sequence_number, int64_t timestamp);
+
+  // Updates packet info identified by |sequence_number| with |send_time_ms|.
+  // Return false if not found.
+  bool OnSentPacket(uint16_t sequence_number, int64_t send_time_ms);
+
   // Look up PacketInfo for a sent packet, based on the sequence number, and
-  // populate all fields except for receive_time. The packet parameter must
+  // populate all fields except for arrival_time. The packet parameter must
   // thus be non-null and have the sequence_number field set.
-  bool GetInfo(PacketInfo* packet, bool remove);
-  void Clear();
+  bool GetInfo(PacketInfo* packet_info, bool remove);
 
  private:
-  void EraseOld();
-  void UpdateOldestSequenceNumber();
+  struct SeqNumComparator {
+    bool operator()(uint16_t lhs, uint16_t rhs) const;
+  };
 
   Clock* const clock_;
-  const int64_t packet_age_limit_;
-  uint16_t oldest_sequence_number_;  // Oldest may not be lowest.
-  std::map<uint16_t, PacketInfo> history_;
+  const int64_t packet_age_limit_ms_;
+  std::map<uint16_t, PacketInfo, SeqNumComparator> history_;
 
-  RTC_DISALLOW_COPY_AND_ASSIGN(SendTimeHistory);
+  RTC_DISALLOW_IMPLICIT_CONSTRUCTORS(SendTimeHistory);
 };
 
 }  // namespace webrtc