Adding histograms for better Omnibox prerender performance tracking.

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 cfd77fd10a4574f0e43df5c1f657b7de26871a7d..402f89a2f76601c134626e3d921552b967ac5d5b 100644
--- a/chrome/browser/prerender/prerender_histograms.cc
+++ b/chrome/browser/prerender/prerender_histograms.cc
@@ -9,6 +9,7 @@
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
 #include "chrome/browser/prerender/prerender_util.h"
+#include "chrome/browser/prerender/prerender_field_trial.h"
 
 namespace prerender {
 
@@ -147,6 +148,21 @@ void PrerenderHistograms::RecordPrerender(Origin origin, const GURL& url) {
   seen_pageload_started_after_prerender_ = false;
 }
 
+void PrerenderHistograms::RecordPrerenderFromOmnibox() const {
+  UMA_HISTOGRAM_COUNTS("Prerender.OmniboxPrerenderCount_" +
+                       GetOmniboxHistogramSuffix(), 1);
+}
+
+void PrerenderHistograms::RecordOmniboxUsedPrerender(Origin origin) const {

[tburkard, 2011/11/22 18:52:05]

You should use the PREFIXED_HISTOGRAM family of macros to do this, or how is
this different from any of the other ones?

+  if (origin == ORIGIN_OMNIBOX_ORIGINAL ||
+      origin == ORIGIN_OMNIBOX_CONSERVATIVE ||
+      origin == ORIGIN_OMNIBOX_EXACT ||
+      origin == ORIGIN_OMNIBOX_EXACT_FULL) {
+    UMA_HISTOGRAM_COUNTS("Prerender.OmniboxNavigationsUsedPrerenderCount_" +
+                         GetOmniboxHistogramSuffix(), 1);
+  }
+}
+
 base::TimeTicks PrerenderHistograms::GetCurrentTimeTicks() const {
   return base::TimeTicks::Now();
 }