MD-Settings: A11y - Label drop down menus.

chrome/browser/resources/settings/device_page/display.html

Index: chrome/browser/resources/settings/device_page/display.html
diff --git a/chrome/browser/resources/settings/device_page/display.html b/chrome/browser/resources/settings/device_page/display.html
index 6491360f4cbbc8ab47b1b4451d183b4d5250c6c5..06923938748234d8c72fdab77dab5ef72f821db6 100644
--- a/chrome/browser/resources/settings/device_page/display.html
+++ b/chrome/browser/resources/settings/device_page/display.html
@@ -118,9 +118,12 @@
       <template is="dom-if" restamp
           if="[[showDisplaySelectMenu_(displays, selectedDisplay)]]">
         <div class="settings-box embedded">
-          <div class="start">$i18n{displayScreenTitle}</div>
+          <div id="displayScreenTitle" class="start">
+            $i18n{displayScreenTitle}
+          </div>
           <div class="md-select-wrapper">
             <select class="md-select" on-change="updatePrimaryDisplay_"
+                aria-labelledby="displayScreenTitle"
                 value="[[getDisplaySelectMenuIndex_(
                     selectedDisplay, primaryDisplayId)]]">
               <option value="0">$i18n{displayScreenPrimary}</option>
@@ -146,9 +149,12 @@
 
       <template is="dom-if" if="[[!unifiedDesktopMode_]]" restamp>
         <div class="settings-box embedded">
-          <div class="start textarea">$i18n{displayOrientation}</div>
+          <div id="displayOrientation" class="start textarea">
+            $i18n{displayOrientation}
+          </div>
           <div class="md-select-wrapper">
             <select class="md-select" value="[[selectedDisplay.rotation]]"
+                aria-labelledby="displayOrientation"
                 on-change="onOrientationChange_">
               <option value="0">$i18n{displayOrientationStandard}</option>
               <option value="90">90</option>