When we trace to file, add eol of each trace message.

webrtc/system_wrappers/source/trace_impl.cc

Index: webrtc/system_wrappers/source/trace_impl.cc
diff --git a/webrtc/system_wrappers/source/trace_impl.cc b/webrtc/system_wrappers/source/trace_impl.cc
index 25da5a0c9ac61ee9fd718fc863b705ae7b16a815..9234ffa3d9762900815edab515baa787d63d7e73 100644
--- a/webrtc/system_wrappers/source/trace_impl.cc
+++ b/webrtc/system_wrappers/source/trace_impl.cc
@@ -448,6 +448,8 @@ void TraceImpl::AddImpl(const TraceLevel level,
     return;
 
   ack_len += len;
+  trace_message[ack_len] = 0;
+  trace_message[ack_len - 1] = '\n';

[pbos-webrtc, 2015/07/24 08:29:11]

Doesn't this truncate the last character?

[braveyao1, 2015/07/24 10:02:39]

I was afraid so. But magically it doesn't. It's equivalence as before. 

   AddMessageToList(trace_message, static_cast<uint16_t>(ack_len), level);
 }