Assume all providers may give zero suggest responses.

chrome/browser/autocomplete/history_url_provider.cc

Index: chrome/browser/autocomplete/history_url_provider.cc
diff --git a/chrome/browser/autocomplete/history_url_provider.cc b/chrome/browser/autocomplete/history_url_provider.cc
index c87a71bd2dd110b763dd113b20488984c263d180..ecf833753fb78756ffba4d1e3e4070eee79b8e12 100644
--- a/chrome/browser/autocomplete/history_url_provider.cc
+++ b/chrome/browser/autocomplete/history_url_provider.cc
@@ -481,7 +481,8 @@ HistoryURLProvider::HistoryURLProvider(AutocompleteProviderListener* listener,
 }
 
 void HistoryURLProvider::Start(const AutocompleteInput& input,
-                               bool minimal_changes) {
+                               bool minimal_changes,
+                               bool on_focus) {
   // NOTE: We could try hard to do less work in the |minimal_changes| case
   // here; some clever caching would let us reuse the raw matches from the
   // history DB without re-querying.  However, we'd still have to go back to
@@ -496,7 +497,7 @@ void HistoryURLProvider::Start(const AutocompleteInput& input,
 
   matches_.clear();
 
-  if ((input.type() == metrics::OmniboxInputType::INVALID) ||
+  if (on_focus || (input.type() == metrics::OmniboxInputType::INVALID) ||
       (input.type() == metrics::OmniboxInputType::FORCED_QUERY))
     return;