[Offline pages] Resetting offline page metadata store if initial load fails

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 502f97d51c27ef34d5feda8a9f310394693dad50..32587ee12190a76d80ee619d0ec58170159862ba 100644
--- a/tools/metrics/histograms/histograms.xml
+++ b/tools/metrics/histograms/histograms.xml
@@ -38962,6 +38962,9 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
 </histogram>
 
 <histogram name="OfflinePages.LoadStatus" enum="OfflinePagesLoadStatus">
+  <obsolete>
+    Deprecated 10/2016, and replaced by OfflinePages.StoreState.
+  </obsolete>
   <owner>jianli@chromium.org</owner>
   <summary>
     Status code of loading from the offline pages metadata store.
@@ -39135,6 +39138,14 @@ http://cs/file:chrome/histograms.xml - but prefer this file for new entries.
   </summary>
 </histogram>
 
+<histogram name="OfflinePages.StoreState" enum="OfflinePagesStoreState">
+  <owner>fgorski@chromium.org</owner>
+  <summary>
+    Store state at the time of initial load or reset of offline page metadata
+    store.
+  </summary>
+</histogram>
+
 <histogram name="OfflinePages.TotalPageSize" units="MB">
   <owner>fgorski@chromium.org</owner>
   <owner>jianli@chromium.org</owner>
@@ -92109,6 +92120,14 @@ value.
   <int value="1" label="Offline"/>
 </enum>
 
+<enum name="OfflinePagesStoreState" type="int">
+  <int value="0" label="Not loaded"/>
+  <int value="1" label="Loaded"/>
+  <int value="2" label="Store load failed"/>
+  <int value="3" label="Store reset failed"/>
+  <int value="4" label="Store operation failed, after store loaded"/>
+</enum>
+
 <enum name="OfflineStatus" type="int">
   <obsolete>
     Deprecated 4/2015.