[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 5b7d2142a9047c42c37632980f57ea2deaf281ce..37ed5e1b72e0f980784e5e0cb38ea7de02c8fb4a 100644
--- a/chrome/browser/resources/md_history/app.vulcanized.html
+++ b/chrome/browser/resources/md_history/app.vulcanized.html
@@ -3701,6 +3701,7 @@ button.more-vert-button div {
 :host {
   --checked-color: rgb(68, 136, 255);
         display: block;
+        outline: none;
 }
 
 :host(:not([embedded])) #main-container {
@@ -4250,7 +4251,7 @@ history-item {
     </div>
     <iron-list items="{{historyData_}}" as="item" id="infinite-list" hidden$="[[!hasResults(historyData_.length)]]">
       <template>
-        <history-item item="[[item]]" selected="{{item.selected}}" is-card-start="[[isCardStart_(item, index, historyData_.length)]]" is-card-end="[[isCardEnd_(item, index, historyData_.length)]]" has-time-gap="[[needsTimeGap_(item, index, historyData_.length)]]" search-term="[[searchedTerm]]" number-of-items="[[historyData_.length]]" path="[[pathForItem_(index)]]" index="[[index]]">
+        <history-item tabindex$="[[tabIndex]]" item="[[item]]" selected="{{item.selected}}" 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]]" iron-list-tab-index="[[tabIndex]]" last-focused="{{lastFocused_}}">
         </history-item>
       </template>
     </iron-list>