tools/metrics/histograms/histograms.xml

Index: tools/metrics/histograms/histograms.xml
diff --git a/tools/metrics/histograms/histograms.xml b/tools/metrics/histograms/histograms.xml
index d9ccb7ac4b17da347a488e03a2ff8d66a105ce88..817603b42f472ff604b8864b34873cf2f2444074 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -42636,6 +42636,16 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Precache.Freshness.Prefetch" units="seconds">
+  <owner>jamartin@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    The freshness lifetimes of the resources that were precached from the moment
+    they were fetched or revalidated as described in RFC 2616 13.2.4. Logged per
+    precache request.
+  </summary>
+</histogram>
+
 <histogram name="Precache.Latency.NonPrefetch" units="ms">
   <owner>twifkak@chromium.org</owner>
   <owner>bengr@chromium.org</owner>
@@ -42693,6 +42703,18 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="Precache.Saved.Freshness" units="seconds">
+  <owner>jamartin@chromium.org</owner>
+  <owner>bengr@chromium.org</owner>
+  <summary>
+    The freshness lifetimes (RFC 2616 13.2.4) of the resources that were
+    precached and later used (and thus served from the cache). This is computed
+    at serving time and thus possibly different from the precached value if the
+    cache entry was revalidated. Logged per-request but only once per URL and
+    precaching cycle (as Precache.Saved).
+  </summary>
+</histogram>
+
 <histogram name="PrefService.CreateProfilePrefsTime" units="ms">
   <owner>rkaplow@chromium.org</owner>
   <summary>The amount of time that elapsed during CreateProfilePrefs.</summary>