Add UMA histograms for more detailed latency tracking on the CRD host.

remoting/protocol/performance_tracker.h

 // 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.
 
 #ifndef REMOTING_PROTOCOL_PERFORMANCE_TRACKER_H_
 #define REMOTING_PROTOCOL_PERFORMANCE_TRACKER_H_
 
 #include "base/callback.h"
 #include "base/timer/timer.h"
 #include "remoting/base/rate_counter.h"
 #include "remoting/base/running_average.h"
 
 namespace remoting {
 
 class VideoPacket;
 
 namespace protocol {
 
 // PerformanceTracker defines a bundle of performance counters and statistics
 // for chromoting.
 class PerformanceTracker {
  public:
   // Callback that updates UMA custom counts or custom times histograms.
   typedef base::Callback<void(const std::string& histogram_name,
-                              int64 value,
+                              int64_t value,
                               int histogram_min,
                               int histogram_max,
                               int histogram_buckets)>
       UpdateUmaCustomHistogramCallback;
 
   // Callback that updates UMA enumeration histograms.
   typedef base::Callback<
-      void(const std::string& histogram_name, int64 value, int histogram_max)>
+      void(const std::string& histogram_name, int64_t value, int histogram_max)>
       UpdateUmaEnumHistogramCallback;
 
   PerformanceTracker();
   virtual ~PerformanceTracker();
 
   // Constant used to calculate the average for rate metrics and used by the
   // plugin for the frequency at which stats should be updated.
   static const int kStatsUpdatePeriodSeconds = 1;
 
   // Return rates and running-averages for different metrics.
@@ skipping 60 matching lines @@
 
   base::RepeatingTimer upload_uma_stats_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(PerformanceTracker);
 };
 
 }  // namespace protocol
 }  // namespace remoting
 
 #endif  // REMOTING_PROTOCOL_PERFORMANCE_TRACKER_H_