[MD History] Fix toolbar dates in grouped mode.

chrome/browser/ui/webui/browsing_history_handler.cc

Index: chrome/browser/ui/webui/browsing_history_handler.cc
diff --git a/chrome/browser/ui/webui/browsing_history_handler.cc b/chrome/browser/ui/webui/browsing_history_handler.cc
index eb66d52a23120c92befb90d71ad7862a9ea16eab..a951127e171211f48d21c04258d63c22e13a3f47 100644
--- a/chrome/browser/ui/webui/browsing_history_handler.cc
+++ b/chrome/browser/ui/webui/browsing_history_handler.cc
@@ -14,7 +14,6 @@
 #include "base/i18n/rtl.h"
 #include "base/i18n/time_formatting.h"
 #include "base/logging.h"
-#include "base/memory/ptr_util.h"
 #include "base/strings/string16.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
@@ -523,6 +522,15 @@ void BrowsingHistoryHandler::OnQueryComplete(
       "queryEndTime",
       GetRelativeDateLocalized(clock_.get(), query_results_info->end_time));
 
+  results_info.SetString(
+      "queryStartMonth",
+      base::TimeFormatMonthAndYear(query_results_info->start_time));
+  results_info.SetString(
+      "queryInterval",
+      base::DateIntervalFormat(query_results_info->start_time,
+                               query_results_info->end_time,
+                               base::DATE_FORMAT_MONTH_WEEKDAY_DAY));
+
   web_ui()->CallJavascriptFunctionUnsafe("historyResult", results_info,
                                          results_value);
 }