Propogate the UI language on the command line and expose to Flash.

ppapi/proxy/ppapi_proxy_test.cc

Index: ppapi/proxy/ppapi_proxy_test.cc
diff --git a/ppapi/proxy/ppapi_proxy_test.cc b/ppapi/proxy/ppapi_proxy_test.cc
index 445f84bcdc01d2be63cbc11cfffe56f00330302b..ac5b535ff88bf889651d05a3419927d3ab5ec48d 100644
--- a/ppapi/proxy/ppapi_proxy_test.cc
+++ b/ppapi/proxy/ppapi_proxy_test.cc
@@ -229,6 +229,10 @@ bool PluginProxyTestHarness::PluginDelegateMock::SendToBrowser(
   return false;
 }
 
+std::string PluginProxyTestHarness::PluginDelegateMock::GetUILanguage() {
+  return std::string("en-US");
+}
+
 void PluginProxyTestHarness::PluginDelegateMock::PreCacheFont(
     const void* logfontw) {
 }