Add a footer about other forms of history to the MD history page.

chrome/browser/resources/md_history/app.js

Index: chrome/browser/resources/md_history/app.js
diff --git a/chrome/browser/resources/md_history/app.js b/chrome/browser/resources/md_history/app.js
index 266e4dfc290750811c8651044c13f8e09ea070de..1e1c7ee54eec816025b964a115d8f4b4e320f448 100644
--- a/chrome/browser/resources/md_history/app.js
+++ b/chrome/browser/resources/md_history/app.js
@@ -18,6 +18,9 @@ Polymer({
   is: 'history-app',
 
   properties: {
+    // Whether to display the footer.
+    showFooter: {type: Boolean, value: false},
+
     // The id of the currently selected page.
     selectedPage_: {
       type: String,
@@ -32,7 +35,7 @@ Polymer({
     },
 
     // Whether the first set of results have returned.
-    firstLoad_: { type: Boolean, value: true },
+    firstLoad_: {type: Boolean, value: true},
 
     // True if the history queries are disabled.
     queryingDisabled_: Boolean,