MD Settings: label and describe a bunch of subpage/open-in-new buttons

chrome/browser/resources/settings/printing_page/printing_page.html

Index: chrome/browser/resources/settings/printing_page/printing_page.html
diff --git a/chrome/browser/resources/settings/printing_page/printing_page.html b/chrome/browser/resources/settings/printing_page/printing_page.html
index 85f5e26fb55e83522a1a6623e24b68c391afa2a9..dbfa5cf78c4124b9c27343c5045bce4fb7557cf2 100644
--- a/chrome/browser/resources/settings/printing_page/printing_page.html
+++ b/chrome/browser/resources/settings/printing_page/printing_page.html
@@ -23,10 +23,9 @@
         <template is="dom-if" if="[[showCupsPrintingFeatures_]]">
           <div id="cupsPrinters" class="settings-box first"
               on-tap="onTapCupsPrinters_" actionable>
-            <div class="start">
-              $i18n{cupsPrintersTitle}
-            </div>
-            <button class="subpage-arrow" is="paper-icon-button-light"></button>
+            <div class="start">$i18n{cupsPrintersTitle}</div>
+            <button class="subpage-arrow" is="paper-icon-button-light"
+                aria-label="$i18n{cupsPrintersTitle}"></button>
           </div>
         </template>
 </if>
@@ -34,9 +33,13 @@
             on-tap="onTapCloudPrinters_" actionable>
           <div class="start">
             $i18n{cloudPrintersTitle}
-            <div class="secondary">$i18n{cloudPrintersTitleDescription}</div>
+            <div class="secondary" id="cloudPrintersSecondary">
+              $i18n{cloudPrintersTitleDescription}
+            </div>
           </div>
-          <button class="subpage-arrow" is="paper-icon-button-light"></button>
+          <button class="subpage-arrow" is="paper-icon-button-light"
+              aria-label="$i18n{cloudPrintersTitle}"
+              aria-describedby="cloudPrintersSecondary"></button>
         </div>
       </neon-animatable>
 <if expr="chromeos">