Omnibox: Rebuild HQP Cache if it's old

chrome/browser/history/url_index_private_data.h

Index: chrome/browser/history/url_index_private_data.h
diff --git a/chrome/browser/history/url_index_private_data.h b/chrome/browser/history/url_index_private_data.h
index 5cd458960ae0c388c0879dd922d006742ab5d4fd..962fd1bdf54d8face7133acf5c2d442caa703251 100644
--- a/chrome/browser/history/url_index_private_data.h
+++ b/chrome/browser/history/url_index_private_data.h
@@ -34,7 +34,7 @@ class InMemoryURLIndex;
 class RefCountedBool;
 
 // Current version of the cache file.
-static const int kCurrentCacheFileVersion = 2;
+static const int kCurrentCacheFileVersion = 3;
 
 // A structure private to InMemoryURLIndex describing its internal data and
 // providing for restoring, rebuilding and updating that internal data. As
@@ -153,6 +153,7 @@ class URLIndexPrivateData
   FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, CacheSaveRestore);
   FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, HugeResultSet);
   FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, ReadVisitsFromHistory);
+  FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, RebuildFromHistoryIfCacheOld);
   FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, Scoring);
   FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, TitleSearch);
   FRIEND_TEST_ALL_PREFIXES(InMemoryURLIndexTest, TypedCharacterCaching);
@@ -335,6 +336,9 @@ class URLIndexPrivateData
   // database this will be 0.
   int restored_cache_version_;
 
+  // The last time the data was rebuilt from the history database.
+  base::Time last_time_rebuilt_from_history_;
+
   // A list of all of indexed words. The index of a word in this list is the
   // ID of the word in the word_map_. It reduces the memory overhead by
   // replacing a potentially long and repeated string with a simple index.