Include a role description string in node info for Android accessibility.

content/shell/common/shell_content_client.h

Index: content/shell/common/shell_content_client.h
diff --git a/content/shell/common/shell_content_client.h b/content/shell/common/shell_content_client.h
index ceebc52d2bda93d34755b9524d490e0bdc720805..ba090e28c185431d976054ebb959b9cb45b3c420 100644
--- a/content/shell/common/shell_content_client.h
+++ b/content/shell/common/shell_content_client.h
@@ -21,6 +21,9 @@ class ShellContentClient : public ContentClient {
 
   std::string GetUserAgent() const override;
   base::string16 GetLocalizedString(int message_id) const override;
+  base::string16 GetLocalizedStringF(
+      int message_id,
+      const base::string16& string0) const override;
   base::StringPiece GetDataResource(
       int resource_id,
       ui::ScaleFactor scale_factor) const override;