SimpleCache: more histograms watching how index is loaded.

net/disk_cache/simple/simple_index.cc

Index: net/disk_cache/simple/simple_index.cc
diff --git a/net/disk_cache/simple/simple_index.cc b/net/disk_cache/simple/simple_index.cc
index e65023b623003cc9b22f5d6ad4f937af53acf552..10b11082167bf37c05f5cf7e38e84c5ada8f7176 100644
--- a/net/disk_cache/simple/simple_index.cc
+++ b/net/disk_cache/simple/simple_index.cc
@@ -407,6 +407,8 @@ void SimpleIndex::InitializeInternal(
     index_file_entries = SimpleIndexFile::LoadFromDisk(index_filename);
     UMA_HISTOGRAM_TIMES("SimpleCache.IndexLoadTime",
                         (base::TimeTicks::Now() - start));
+    UMA_HISTOGRAM_COUNTS("SimpleCache.IndexEntriesLoaded",
+                         index_file_entries->size());
   }
 
   UMA_HISTOGRAM_BOOLEAN("SimpleCache.IndexStale", index_stale);
@@ -415,8 +417,10 @@ void SimpleIndex::InitializeInternal(
   if (!index_file_entries) {
     const base::TimeTicks start = base::TimeTicks::Now();
     index_file_entries = SimpleIndex::RestoreFromDisk(index_filename);
-    UMA_HISTOGRAM_TIMES("SimpleCache.IndexRestoreTime",
-                        (base::TimeTicks::Now() - start));
+    UMA_HISTOGRAM_MEDIUM_TIMES("SimpleCache.IndexRestoreTime",
+                               (base::TimeTicks::Now() - start));

[jar (doing other things), 2013/06/05 18:17:54]

nit: no need for redundant parens.  Good macro do this tsuff for you (if it
needs to be done ;-) ).

[pasko, 2013/06/05 18:39:37]

Done.

+    UMA_HISTOGRAM_COUNTS("SimpleCache.IndexEntriesRestored",
+                         index_file_entries->size());
 
     // When we restore from disk we write the merged index file to disk right
     // away, this might save us from having to restore again next time.