Add accessible name to TranslateBubbleView source_language_combobox_

Bug: 1148885
Change-Id: Ic517dddf9d4521cbe5b7338b47d74f84e251ee3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537935Reviewed-by: Scott Little <sclittle@chromium.org>
Commit-Queue: Anthony Cui <cuianthony@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827446}

chrome/app/generated_resources.grd

@@ -8498,6 +8498,9 @@ Please help our engineers fix this problem. Tell us what happened right before y
         <message name="IDS_TRANSLATE_BUBBLE_COULD_NOT_TRANSLATE_TITLE" desc="Title text for the translate bubble label when the page could not be translated.">
           This page could not be translated
         </message>
+        <message name="IDS_TRANSLATE_BUBBLE_SOURCE_LANG_COMBOBOX_ACCNAME" desc="Accessible name for the source language selection combobox.">
+          Choose the page language to translate from
+        </message>
         <message name="IDS_TRANSLATE_BUBBLE_TARGET_LANG_COMBOBOX_ACCNAME" desc="Accessible name for the target language selection combobox.">
           Choose the language to translate the page to
         </message>

chrome/app/generated_resources_grd/IDS_TRANSLATE_BUBBLE_SOURCE_LANG_COMBOBOX_ACCNAME.png.sha1

+da34f258f8325d10f17c6757353dd8491a93a40a
\ No newline at end of file

chrome/browser/ui/views/translate/translate_bubble_view.cc

@@ -812,6 +812,8 @@ std::unique_ptr<views::View> TranslateBubbleView::CreateViewAdvancedSource() {
 
   source_language_combobox->SetCallback(base::BindRepeating(
       &TranslateBubbleView::SourceLanguageChanged, base::Unretained(this)));
+  source_language_combobox->SetAccessibleName(l10n_util::GetStringUTF16(
+      IDS_TRANSLATE_BUBBLE_SOURCE_LANG_COMBOBOX_ACCNAME));
   source_language_combobox_ = source_language_combobox.get();
 
   auto advanced_done_button = std::make_unique<views::MdTextButton>(