logs are now using a sync version of postMessage().

This avoid various preemption issues (e.g. JS code being called in error
        reporting).
This is temporary because we need to be able to call logs function from
different threads.

src/Core/Context.cpp

@@ -71,7 +71,7 @@ void Context::logFlush()
     m_LogBuffering = false;
 
     if (m_Logbuffer.length()) {
-        this->postMessage(strdup(m_Logbuffer.c_str()), kContextMessage_log);
+        this->postMessageSync(strdup(m_Logbuffer.c_str()), kContextMessage_log);
         m_Logbuffer.clear();
         m_Logbuffer.shrink_to_fit();
     }
@@ -84,7 +84,7 @@ void Context::log(const char *str)
 
         return;
     }
-    this->postMessage(strdup(str), kContextMessage_log);
+    this->postMessageSync(strdup(str), kContextMessage_log);
 }
 
 void Context::vlog(const char *format, ...)