a11y: Add a11y information to views::Tab and manually ignore its a11y children.

ui/strings/ui_strings.grd

Index: ui/strings/ui_strings.grd
diff --git a/ui/strings/ui_strings.grd b/ui/strings/ui_strings.grd
index 522e2ba5d5abf52a76de8113099ec9a86f6e4d39..4e25b4c4feeee4ec6602c439ff25fd3ecb3faa5c 100644
--- a/ui/strings/ui_strings.grd
+++ b/ui/strings/ui_strings.grd
@@ -271,6 +271,11 @@ need to be translated for each locale.-->
       </message>
 
       <!-- General application strings -->
+      <if expr="is_macosx">
+        <message name="IDS_ACCNAME_TAB" desc="A generic description of a tab button's role" meaning="UI element">

[tapted, 2017/01/06 04:25:11]

I think this should be grouped with "Accessible name strings" on line 325.

and for the name itself, we should probably update it to something more
descriptive. E.g.

IDS_ACCNAME_TAB_ROLE_DESCRIPTION

[Patti Lor, 2017/01/09 22:39:27]

Done.

+          Tab
+        </message>
+      </if>
       <if expr="is_win or is_ios">
         <message name="IDS_APP_UNTITLED_SHORTCUT_FILE_NAME" desc="The name of the Internet Shortcut file created for URLs dragged that have no title">
           Untitled Webpage