MD History: Add routing for grouped history mode.

chrome/browser/resources/md_history/history_toolbar.js

Index: chrome/browser/resources/md_history/history_toolbar.js
diff --git a/chrome/browser/resources/md_history/history_toolbar.js b/chrome/browser/resources/md_history/history_toolbar.js
index 53c8438f21b8fed1927753a87f613930f2921bde..2ecf3e86b06ee2535db6be020917b373d883c765 100644
--- a/chrome/browser/resources/md_history/history_toolbar.js
+++ b/chrome/browser/resources/md_history/history_toolbar.js
@@ -143,6 +143,9 @@ Polymer({
   /** @private */
   getHistoryInterval_: function() {
     var info = this.queryInfo;
+    if (!info)
+      return;

[calamity, 2017/01/27 03:47:34]

When can this happen?

[tsergeant, 2017/01/30 02:13:14]

It gets called when queryResult.info is set to null during initialization:
https://cs.chromium.org/chromium/src/chrome/browser/resources/md_history/app....

This already happens, but it just becomes a problem now because it's possible
for the `if` conditionals to be true.

+
     if (this.groupedRange == HistoryRange.WEEK)
       return info.queryInterval;