Proxy: solve event tracing with compile time strings.

This change creates trace events with a single parameter
composed of ClassName::Method.

The change additionally causes the duration of the proxy call to be
traced, not only the occurrence.

Fixed: webrtc:12787
Change-Id: I1689862318d4c6fc1dcef343c3ccf3ae9f7e17df
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/219788
Commit-Queue: Markus Handell <handellm@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#34149}
diff --git a/pc/rtp_receiver_proxy.h b/pc/rtp_receiver_proxy.h
index 409612e..d4114e0 100644
--- a/pc/rtp_receiver_proxy.h
+++ b/pc/rtp_receiver_proxy.h
@@ -47,7 +47,7 @@
 PROXY_SECONDARY_METHOD1(void,
                         SetDepacketizerToDecoderFrameTransformer,
                         rtc::scoped_refptr<FrameTransformerInterface>)
-END_PROXY_MAP()
+END_PROXY_MAP(RtpReceiver)
 
 }  // namespace webrtc