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

content/public/common/content_client.cc

Index: content/public/common/content_client.cc
diff --git a/content/public/common/content_client.cc b/content/public/common/content_client.cc
index e7f50c8df98375864e06dda79d52b8cd9943c2f7..000f993088f901dc5a448ca261f235071aedb703 100644
--- a/content/public/common/content_client.cc
+++ b/content/public/common/content_client.cc
@@ -84,6 +84,12 @@ base::string16 ContentClient::GetLocalizedString(int message_id) const {
   return base::string16();
 }
 
+base::string16 ContentClient::GetLocalizedStringF(
+    int message_id,
+    const base::string16& string0) const {
+  return base::string16();
+}
+
 base::StringPiece ContentClient::GetDataResource(
     int resource_id,
     ui::ScaleFactor scale_factor) const {