Add ARIA labels for the printers Browse button

-Creating a new ARIA specific string for the Browse button as the text
 already displayed next to the button($i18n{selectDriver}) would not
 make sense spoken out loud.

Bug: 987087
Change-Id: I00a3d28672b0ffb85ddc00b49b605975b5e5b182
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1869478Reviewed-by: Hector Carmona <hcarmona@chromium.org>
Reviewed-by: Bailey Berro <baileyberro@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710680}

chrome/app/settings_strings.grdp

@@ -1610,6 +1610,9 @@
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_SELECT_DRIVER" desc="Label for the file selector to manually select a PPD file from the user's file system.">
       Or specify your printer PPD
     </message>
+    <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_BUTTON_SELECT_DRIVER_ARIA_LABEL" desc="ARIA label for the file selector button to manually select a PPD file from the user's file system. This text will not be visual on any page. It will only be spoken by screen readers.">
+      Browse to specify your printer PPD
+    </message>
     <message name="IDS_SETTINGS_PRINTING_CUPS_PRINTER_BUTTON_SELECT_DRIVER" desc="Text for the button which allows user to select a PPD file from the file system.">
       Browse
     </message>

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

@@ -204,7 +204,8 @@
               aria-labelledby="ppdLabel" invalid="[[invalidPPD_]]"
               error-message="$i18n{selectDriverErrorMessage}" tabindex="-1">
           </cr-input>
-          <cr-button class="browse-button" on-click="onBrowseFile_">
+          <cr-button class="browse-button" on-click="onBrowseFile_"
+              aria-label="$i18n{selectDriverButtonAriaLabel}">
             $i18n{selectDriverButtonText}
           </cr-button>
         </div>

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

@@ -136,7 +136,8 @@
                 invalid="[[invalidPPD_]]">
             </cr-input>
             <cr-button class="browse-button" on-click="onBrowseFile_"
-            disabled="[[!isOnline_]]">
+                disabled="[[!isOnline_]]"
+                aria-label="$i18n{selectDriverButtonAriaLabel}">
               $i18n{selectDriverButtonText}
             </cr-button>
           </div>

chrome/browser/ui/webui/settings/settings_localized_strings_provider.cc

@@ -2401,6 +2401,8 @@ void AddPrintingStrings(content::WebUIDataSource* html_source) {
     {"selectDriver", IDS_SETTINGS_PRINTING_CUPS_PRINTER_SELECT_DRIVER},
     {"selectDriverButtonText",
      IDS_SETTINGS_PRINTING_CUPS_PRINTER_BUTTON_SELECT_DRIVER},
+    {"selectDriverButtonAriaLabel",
+     IDS_SETTINGS_PRINTING_CUPS_PRINTER_BUTTON_SELECT_DRIVER_ARIA_LABEL},
     {"selectDriverErrorMessage",
      IDS_SETTINGS_PRINTING_CUPS_PRINTER_INVALID_DRIVER},
     {"printerAddedSuccessfulMessage",