[Mac A11y] Give the tab strip an accessible name.

This ensures that the tab strip name is announced when it is focused by
the accessible pane manager.

Bug: 1097760
Change-Id: Ieba4986c83ae750feb3c4b0690a3d0bc6eca39d7
AX-Relnotes: Tab strip is named "Tab strip".
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2588892
Commit-Queue: Abigail Klein <abigailbklein@google.com>
Reviewed-by: Elly Fong-Jones <ellyjones@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836720}

chrome/app/generated_resources.grd

@@ -5896,6 +5896,9 @@ the Bookmarks menu.">
       <message name="IDS_ACCNAME_TAB_SEARCH" desc="The accessible name for the Tab Search bubble.">
         Search tabs
       </message>
+      <message name="IDS_ACCNAME_TAB_STRIP" desc="The accessible name for the tab strip.">
+        Tab strip
+      </message>
 
       <!-- Clipboard permission -->
       <message name="IDS_ALLOWED_CLIPBOARD_TITLE" desc="Title of the info bubble shown when a site has been allowed access to read the contents of the system clipboard.">

chrome/app/generated_resources_grd/IDS_ACCNAME_TAB_STRIP.png.sha1

+ff5f5bf5bcaf277a191b7f9ecd25a0053209d92b
\ No newline at end of file

chrome/browser/ui/views/frame/tab_strip_region_view.cc

@@ -235,6 +235,7 @@ views::View* TabStripRegionView::GetDefaultFocusableChild() {
 
 void TabStripRegionView::GetAccessibleNodeData(ui::AXNodeData* node_data) {
   node_data->role = ax::mojom::Role::kTabList;
+  node_data->SetName(l10n_util::GetStringUTF16(IDS_ACCNAME_TAB_STRIP));
 }
 
 void TabStripRegionView::OnViewPreferredSizeChanged(View* view) {