PDFViewerUpdate: Add aria-label for zoom text input.

Fixed: 1133417
Change-Id: Ic18c3f8410dccb03afd1ba14fec4d9f1ff3407e8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437818
Auto-Submit: dpapad <dpapad@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Commit-Queue: dpapad <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812065}

chrome/browser/pdf/pdf_extension_util.cc

@@ -68,6 +68,7 @@ void AddPdfViewerStrings(base::Value* dict) {
     {"tooltipRotateCCW", IDS_PDF_TOOLTIP_ROTATE_CCW},
     {"tooltipRotateCW", IDS_PDF_TOOLTIP_ROTATE_CW},
     {"tooltipThumbnails", IDS_PDF_TOOLTIP_THUMBNAILS},
+    {"zoomTextInputAriaLabel", IDS_PDF_ZOOM_TEXT_INPUT_ARIA_LABEL},
 #if defined(OS_CHROMEOS)
     {"tooltipAnnotate", IDS_PDF_ANNOTATION_ANNOTATE},
     {"annotationDocumentTooLarge", IDS_PDF_ANNOTATION_DOCUMENT_TOO_LARGE},

chrome/browser/resources/pdf/elements/viewer-pdf-toolbar-new.html

@@ -188,8 +188,9 @@
       <cr-icon-button iron-icon="pdf:remove" title="$i18n{tooltipZoomOut}"
           aria-label="$i18n{tooltipZoomOut}" on-click="onZoomOutClick_">
       </cr-icon-button>
-      <input type="text" value="100%" on-input="onZoomInput_"
-          on-pointerup="onZoomInputPointerup_"
+      <input type="text" value="100%"
+          aria-label="$i18n{zoomTextInputAriaLabel}"
+          on-input="onZoomInput_" on-pointerup="onZoomInputPointerup_"
           on-blur="onZoomInputBlur_">
       </input>
       <cr-icon-button iron-icon="pdf:add" title="$i18n{tooltipZoomIn}"

components/pdf_strings.grdp

@@ -61,6 +61,9 @@
     <message name="IDS_PDF_ANNOTATIONS_SHOW_TOGGLE" desc="Button text for toggling showing annotations on the PDF document">
       Annotations
     </message>
+    <message name="IDS_PDF_ZOOM_TEXT_INPUT_ARIA_LABEL" desc="aria-label describing the zoom level text input">
+      Zoom level
+    </message>
     <message name="IDS_PDF_TOOLTIP_ZOOM_IN" desc="Button tooltip for the button which zooms in a PDF, so that the document appears larger">
       Zoom in
     </message>

components/pdf_strings_grdp/IDS_PDF_ZOOM_TEXT_INPUT_ARIA_LABEL.png.sha1

+d18d1eaed325a2fc245262e5bff4cbde75cf7351
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