Merge branch 'google3' to roll forward to cl/340537221.

cpp/core/internal/mediums/webrtc.cc

@@ -42,6 +42,10 @@ WebRtc::~WebRtc() {
   Disconnect();
 }
 
+const std::string WebRtc::GetDefaultCountryCode() {
+  return medium_.GetDefaultCountryCode();
+}
+
 bool WebRtc::IsAvailable() { return medium_.IsValid(); }
 
 bool WebRtc::IsAcceptingConnections() {

cpp/core/internal/mediums/webrtc.h

@@ -44,6 +44,10 @@ class WebRtc {
   WebRtc();
   ~WebRtc();
 
+  // Gets the default two-letter country code associated with current locale.
+  // For example, en_US locale resolves to "US".
+  const std::string GetDefaultCountryCode();
+
   // Returns if WebRtc is available as a medium for nearby to transport data.
   // Runs on @MainThread.
   bool IsAvailable();