[MD History] Add keyboard navigation to the main history list.

chrome/browser/resources/md_history/app.vulcanized.html

Index: chrome/browser/resources/md_history/app.vulcanized.html
diff --git a/chrome/browser/resources/md_history/app.vulcanized.html b/chrome/browser/resources/md_history/app.vulcanized.html
index 7f765331739e8b679a934f12547372a60b5a06cc..4e363577fa450243b8d4fd675f7892d537e78ff4 100644
--- a/chrome/browser/resources/md_history/app.vulcanized.html
+++ b/chrome/browser/resources/md_history/app.vulcanized.html
@@ -3686,6 +3686,7 @@ button.more-vert-button div {
 :host {
   --checked-color: rgb(68, 136, 255);
         display: block;
+        outline: none;
 }
 
 :host(:not([embedded])) #main-container {
@@ -4229,7 +4230,7 @@ history-item {
     </div>
     <iron-list items="{{historyData_}}" as="item" id="infinite-list" hidden$="[[!hasResults(historyData_.length)]]">
       <template>
-        <history-item item="[[item]]" selected="{{item.selected}}" is-first-item="[[isFirstItem_(index)]]" is-card-start="[[isCardStart_(item, index, historyData_.length)]]" is-card-end="[[isCardEnd_(item, index, historyData_.length)]]" has-time-gap="[[needsTimeGap_(item, index, historyData_.length)]]" search-term="[[searchedTerm]]" number-of-items="[[historyData_.length]]" path="[[pathForItem_(index)]]" index="[[index]]">
+        <history-item tabindex="-1" item="[[item]]" selected="{{item.selected}}" is-first-item="[[isFirstItem_(index)]]" is-card-start="[[isCardStart_(item, index, historyData_.length)]]" is-card-end="[[isCardEnd_(item, index, historyData_.length)]]" has-time-gap="[[needsTimeGap_(item, index, historyData_.length)]]" search-term="[[searchedTerm]]" number-of-items="[[historyData_.length]]" path="[[pathForItem_(index)]]" index="[[index]]" tab-index="[[tabIndex]]" last-focused="{{lastFocused_}}">
         </history-item>
       </template>
     </iron-list>