Adding histograms for better Omnibox prerender performance tracking.

chrome/browser/prerender/prerender_manager.cc

Index: chrome/browser/prerender/prerender_manager.cc
diff --git a/chrome/browser/prerender/prerender_manager.cc b/chrome/browser/prerender/prerender_manager.cc
index 18093a932c96f1e72d12bfa15f0c789a2a624cd6..98f161d1b43d56f611a0f4ba1aab3f648326e528 100644
--- a/chrome/browser/prerender/prerender_manager.cc
+++ b/chrome/browser/prerender/prerender_manager.cc
@@ -357,6 +357,8 @@ bool PrerenderManager::AddPrerenderFromOmnibox(
       NOTREACHED();
       break;
   };
+  UMA_HISTOGRAM_COUNTS("Prerender.OmniboxPrerenderCount_" +
+                       prerender::GetOmniboxHistogramSuffix(), 1);
 
   return AddPrerender(origin, std::make_pair(-1, -1), url, GURL(),
                       session_storage_namespace);
@@ -646,6 +648,13 @@ bool PrerenderManager::MaybeUsePrerenderedPage(TabContents* tab_contents,
   histograms_->RecordPerSessionCount(++prerenders_per_session_count_);
   prerender_contents->set_final_status(FINAL_STATUS_USED);
 
+  if (prerender_contents->origin() == ORIGIN_OMNIBOX_ORIGINAL ||
+      prerender_contents->origin() == ORIGIN_OMNIBOX_CONSERVATIVE ||
+      prerender_contents->origin() == ORIGIN_OMNIBOX_EXACT) {
+    UMA_HISTOGRAM_COUNTS("Prerender.OmniboxNavigationsUsedPrerenderCount_" +

[tburkard, 2011/11/21 23:45:39]

Wouldn't this fit nicer into prerender_histograms which already has a way to
construct such histogram names for the different prerender types?

+                         prerender::GetOmniboxHistogramSuffix(), 1);
+  }
+
   new_render_view_host->Send(
       new ChromeViewMsg_SetIsPrerendering(new_render_view_host->routing_id(),
                                           false));