Enable logging from Chromoting client plugin in PNaCl.

remoting/client/plugin/chromoting_instance.cc

Index: remoting/client/plugin/chromoting_instance.cc
diff --git a/remoting/client/plugin/chromoting_instance.cc b/remoting/client/plugin/chromoting_instance.cc
index f0f9959d46446f771105627b2cf17e64c0f3a340..4b1e996acb6b49d6f35051a1c67e943c62f8ccfd 100644
--- a/remoting/client/plugin/chromoting_instance.cc
+++ b/remoting/client/plugin/chromoting_instance.cc
@@ -228,6 +228,9 @@ ChromotingInstance::ChromotingInstance(PP_Instance pp_instance)
   thread_wrapper_.reset(
       new jingle_glue::JingleThreadWrapper(plugin_task_runner_));
   media::InitializeCPUSpecificYUVConversions();
+
+  // Register a global log handler.
+  ChromotingInstance::RegisterLogMessageHandler();
 #else
   jingle_glue::JingleThreadWrapper::EnsureForCurrentMessageLoop();
 #endif