Use filter context to track stats better in SDCH filtering

base/histogram.h

 // Copyright (c) 2006-2008 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.
 
 // Histogram is an object that aggregates statistics, and can summarize them in
 // various forms, including ASCII graphical, HTML, and numerically (as a
 // vector of numbers corresponding to each of the aggregating buckets).
 
 // It supports calls to accumulate either time intervals (which are processed
 // as integral number of milliseconds), or arbitrary integral units.
@@ skipping 42 matching lines @@
 #define HISTOGRAM_COUNTS(name, sample) do { \
     static Histogram counter((name), 1, 1000000, 50); \
     counter.Add(sample); \
   } while (0)
 
 #define HISTOGRAM_COUNTS_100(name, sample) do { \
     static Histogram counter((name), 1, 100, 50); \
     counter.Add(sample); \
   } while (0)
 
+#define HISTOGRAM_PERCENTAGE(name, under_one_hundred) do { \
+    static LinearHistogram counter((name), 1, 100, 101); \
+    counter.Add(under_one_hundred); \
+  } while (0)
+
 // For folks that need real specific times, use this, but you'll only get
 // samples that are in the range (overly large samples are discarded).
 #define HISTOGRAM_CLIPPED_TIMES(name, sample, min, max, bucket_count) do { \
     static Histogram counter((name), min, max, bucket_count); \
     if ((sample) < (max)) counter.AddTime(sample); \
   } while (0)
 
 //------------------------------------------------------------------------------
 // This macro set is for a histogram that can support both addition and removal
 // of samples. It should be used to render the accumulated asset allocation
@@ skipping 18 matching lines @@
   } while (0)
 
 //------------------------------------------------------------------------------
 // Define Debug vs non-debug flavors of macros.
 #ifndef NDEBUG
 
 #define DHISTOGRAM_TIMES(name, sample) HISTOGRAM_TIMES(name, sample)
 #define DHISTOGRAM_COUNTS(name, sample) HISTOGRAM_COUNTS(name, sample)
 #define DASSET_HISTOGRAM_COUNTS(name, sample) ASSET_HISTOGRAM_COUNTS(name, \
                                                                      sample)
+#define DHISTOGRAM_PERCENTAGE(name, under_one_hundred) HISTOGRAM_PERCENTAGE(\
+    name, under_one_hundred)
 #define DHISTOGRAM_CLIPPED_TIMES(name, sample, min, max, bucket_count) \
     HISTOGRAM_CLIPPED_TIMES(name, sample, min, max, bucket_count)
 
 #else  // NDEBUG
 
 #define DHISTOGRAM_TIMES(name, sample) do {} while (0)
 #define DHISTOGRAM_COUNTS(name, sample) do {} while (0)
 #define DASSET_HISTOGRAM_COUNTS(name, sample) do {} while (0)
+#define DHISTOGRAM_PERCENTAGE(name, under_one_hundred) do {} while (0)
 #define DHISTOGRAM_CLIPPED_TIMES(name, sample, min, max, bucket_count) \
     do {} while (0)
 
 #endif  // NDEBUG
 
 //------------------------------------------------------------------------------
 // The following macros provide typical usage scenarios for callers that wish
 // to record histogram data, and have the data submitted/uploaded via UMA.
 // Not all systems support such UMA, but if they do, the following macros
 // should work with the service.
@@ skipping 50 matching lines @@
     counter.SetFlags(kUmaTargetedHistogramFlag); \
     counter.Add(sample); \
   } while (0)
 
 #define UMA_HISTOGRAM_MEMORY_MB(name, sample) do { \
     static Histogram counter((name), 1, 1000, 50); \
     counter.SetFlags(kUmaTargetedHistogramFlag); \
     counter.Add(sample); \
   } while (0)
 
+#define UMA_HISTOGRAM_PERCENTAGE(name, under_one_hundred) do { \
+    static LinearHistogram counter((name), 1, 100, 101); \
+    counter.SetFlags(kUmaTargetedHistogramFlag); \
+    counter.Add(under_one_hundred); \
+  } while (0)
+
 //------------------------------------------------------------------------------
 
 class Histogram : public StatsRate {
  public:
   typedef int Sample;  // Used for samples (and ranges of samples).
   typedef int Count;  // Used to count samples in a bucket.
   static const Sample kSampleType_MAX = INT_MAX;
 
   typedef std::vector<Count> Counts;
   typedef std::vector<Sample> Ranges;
@@ skipping 332 matching lines @@
   // lock protects access to the above map.
   static Lock* lock_;
 
   // Dump all known histograms to log.
   static bool dump_on_exit_;
 
   DISALLOW_COPY_AND_ASSIGN(StatisticsRecorder);
 };
 
 #endif  // BASE_HISTOGRAM_H__