[NoStatePrefetch] Track redirects in UMA

chrome/browser/prerender/prerender_histograms.h

Index: chrome/browser/prerender/prerender_histograms.h
diff --git a/chrome/browser/prerender/prerender_histograms.h b/chrome/browser/prerender/prerender_histograms.h
index f2d5de391b00176fbe5777c90cbbee2ebd41bdd4..381cb7b1f690adf5424c4603696835813de53e1c 100644
--- a/chrome/browser/prerender/prerender_histograms.h
+++ b/chrome/browser/prerender/prerender_histograms.h
@@ -108,11 +108,19 @@ class PrerenderHistograms {
                           int64_t prerender_bytes,
                           int64_t profile_bytes) const;
 
-  // Record resources loaded by NoStatePrefetch.
+  // Called when a NoStatePrefetch request has received a response (including
+  // redirects). May be called several times per resource, in case of redirects.
   void RecordResourcePrefetch(Origin origin,

[pasko, 2016/09/02 16:34:48]

Seems like a more self-descriptivename would be: RecordPrefetchResponseReceived

[droger, 2016/09/05 12:38:47]

Done.

                               bool is_main_resource,
+                              bool is_redirect,
                               bool is_no_store) const;
 
+  // Called when a NoStatePrefetch resource has been loaded. This is called only
+  // once per resource, when all redirects have been resolved.
+  void RecordPrefetchRedirectCount(Origin origin,
+                                   bool is_main_resource,
+                                   size_t redirect_count) const;
+
  private:
   base::TimeTicks GetCurrentTimeTicks() const;