crostini: More descriptive aria label for the disk resizing button.

Test: Manual with ChromeVox
Bug: chromium:1061778
Change-Id: Iec82ac9c785dafea14e4a4484178b2b5c0fca007
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2135104
Commit-Queue: David Munro <davidmunro@google.com>
Reviewed-by: Julian Watson <juwa@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#756954}

chrome/app/os_settings_strings.grdp

@@ -964,6 +964,9 @@
   <message name="IDS_SETTINGS_CROSTINI_DISK_RESIZE_SHOW_BUTTON" desc="The label of the button/link the user clicks to open the disk resizing dialogue." meaning="The label of the button/link the user clicks to open the disk resizing dialogue.">
     Change
   </message>
+  <message name="IDS_SETTINGS_CROSTINI_DISK_RESIZE_SHOW_BUTTON_ARIA_LABEL" desc="The aria label for the button to show the disk resize dialog i.e. the text that screen readers will read out for the button.">
+    Change disk size
+  </message>
   <message name="IDS_SETTINGS_CROSTINI_DISK_RESIZE_LABEL" desc="The label on the row in settings for managing Crostini's disk size.">
     Disk size
   </message>

chrome/app/os_settings_strings_grdp/IDS_SETTINGS_CROSTINI_DISK_RESIZE_SHOW_BUTTON_ARIA_LABEL.png.sha1

+2046be897f9f41f531d6d3c4d1487befb11ad631
\ No newline at end of file

chrome/browser/resources/settings/chromeos/crostini_page/crostini_subpage.html

@@ -80,12 +80,13 @@
     </template>
     <template is="dom-if" if="[[showCrostiniDiskResize_]]">
       <div class="settings-box hr" id="crostini-disk-resize">
-        <div class="start">
+        <div class="start" aria-hidden="true">
           $i18n{crostiniDiskResizeLabel}
         </div>
         <cr-button on-click="onDiskResizeClick_"
-            aria-labelledby="diskResizeLabel" id="showDiskResizeButton">
-            $i18n{crostiniDiskResizeShowButton}
+            aria-label="$i18n{crostiniDiskResizeShowButtonAriaLabel}"
+            id="showDiskResizeButton">
+          $i18n{crostiniDiskResizeShowButton}
         </cr-button>
       </div>
       <template is="dom-if" if="[[showDiskResizeDialog_]]" restamp>

chrome/browser/ui/webui/settings/chromeos/os_settings_localized_strings_provider.cc

@@ -702,6 +702,8 @@ void AddCrostiniStrings(content::WebUIDataSource* html_source,
       {"crostiniDiskResizeTitle", IDS_SETTINGS_CROSTINI_DISK_RESIZE_TITLE},
       {"crostiniDiskResizeShowButton",
        IDS_SETTINGS_CROSTINI_DISK_RESIZE_SHOW_BUTTON},
+      {"crostiniDiskResizeShowButtonAriaLabel",
+       IDS_SETTINGS_CROSTINI_DISK_RESIZE_SHOW_BUTTON_ARIA_LABEL},
       {"crostiniDiskResizeLabel", IDS_SETTINGS_CROSTINI_DISK_RESIZE_LABEL},
       {"crostiniDiskResizeUnsupported",
        IDS_SETTINGS_CROSTINI_DISK_RESIZE_UNSUPPORTED},