Reports Prerender and Profile Total Bytes

chrome/browser/prerender/prerender_histograms.cc

Index: chrome/browser/prerender/prerender_histograms.cc
diff --git a/chrome/browser/prerender/prerender_histograms.cc b/chrome/browser/prerender/prerender_histograms.cc
index 236c17d4e85e3420b85a2e29dc52d916fef6a88c..69eb30be1b60b0c8d1ccb658bfe50623f52f89bf 100644
--- a/chrome/browser/prerender/prerender_histograms.cc
+++ b/chrome/browser/prerender/prerender_histograms.cc
@@ -409,6 +409,17 @@ void PrerenderHistograms::RecordPrerenderPageVisitedStatus(
       UMA_HISTOGRAM_BOOLEAN(name, visited_before));
 }
 
+void PrerenderHistograms::RecordNetworkBytes(bool used,
+                                             int64 prerender_bytes,
+                                             int64 profile_bytes) {
+  if (used)
+    UMA_HISTOGRAM_COUNTS("Prerender.NetworkBytes.Used", prerender_bytes);

[Alexei Svitkine (slow), 2014/02/13 16:28:44]

The default UMA_HISTOGRAM_COUNTS() macro defines a max of 1000000, which is
probably too low when you're logging bytes (i.e. I would expect you might get
enough records above that, that it's worth using a higher max).

Probably, 100M is a good max to use (by reasoning of 10M still possibly being
too low for some pages, so next magnitude).

Change these to:

const int kHistogramMin = 1;
const int kHistogramMax = 100000000;  // 100M.
const int kBucketCount = 50;

UMA_HISTOGRAM_CUSTOM_COUNTS("Prerender.NetworkBytes.Used", prerender_bytes,
                            kHistogramMin, kHistogramMax, kBucketCount)

[jkarlin, 2014/02/13 17:27:52]

Done.  Thanks!

On 2014/02/13 16:28:44, Alexei Svitkine wrote:

+  else
+    UMA_HISTOGRAM_COUNTS("Prerender.NetworkBytes.Wasted", prerender_bytes);
+
+  UMA_HISTOGRAM_COUNTS("Prerender.NetworkBytes.TotalForProfile", profile_bytes);
+}
+
 uint8 PrerenderHistograms::GetCurrentExperimentId() const {
   if (!WithinWindow())
     return kNoExperiment;