Create a more fine grained histogram of SDCH payload sizes

r=mbelshe
Review URL: http://codereview.chromium.org/149119

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@19491 0039d316-1c4b-4281-b951-d872f2087c98

base/histogram.h

@@ -63,6 +63,11 @@
     counter.Add(sample); \
   } while (0)
 
+#define HISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) do { \
+    static Histogram counter((name), min, max, bucket_count); \
+    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); \
@@ -118,6 +123,8 @@
     HISTOGRAM_CUSTOM_TIMES(name, sample, min, max, bucket_count)
 #define DHISTOGRAM_CLIPPED_TIMES(name, sample, min, max, bucket_count) \
     HISTOGRAM_CLIPPED_TIMES(name, sample, min, max, bucket_count)
+#define DHISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) \
+  HISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count)
 
 #else  // NDEBUG
 
@@ -129,6 +136,9 @@
     do {} while (0)
 #define DHISTOGRAM_CLIPPED_TIMES(name, sample, min, max, bucket_count) \
     do {} while (0)
+#define DHISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) \
+  do {} while (0)
+
 
 #endif  // NDEBUG
 
@@ -197,6 +207,12 @@ static const int kRendererHistogramFlag = 1 << 4;
     counter.Add(sample); \
   } while (0)
 
+#define UMA_HISTOGRAM_CUSTOM_COUNTS(name, sample, min, max, bucket_count) do { \
+    static Histogram counter((name), min, max, bucket_count); \
+    counter.SetFlags(kUmaTargetedHistogramFlag); \
+    counter.Add(sample); \
+  } while (0)
+
 #define UMA_HISTOGRAM_MEMORY_KB(name, sample) do { \
     static Histogram counter((name), 1000, 500000, 50); \
     counter.SetFlags(kUmaTargetedHistogramFlag); \

net/url_request/url_request_job.cc

@@ -595,8 +595,8 @@ void URLRequestJob::RecordPacketStats(StatisticSelector statistic) const {
                                   base::TimeDelta::FromMinutes(10), 100);
       UMA_HISTOGRAM_COUNTS_100("Sdch3.Network_Decode_Packets_b",
                                static_cast<int>(observed_packet_count_));
-      UMA_HISTOGRAM_COUNTS("Sdch3.Network_Decode_Bytes_Processed_a",
-          static_cast<int>(bytes_observed_in_packets_));
+      UMA_HISTOGRAM_CUSTOM_COUNTS("Sdch3.Network_Decode_Bytes_Processed_b",
+          static_cast<int>(bytes_observed_in_packets_), 500, 100000, 100);
       if (packet_times_.empty())
         return;
       UMA_HISTOGRAM_CLIPPED_TIMES("Sdch3.Network_Decode_1st_To_Last_a",