More trace events

The goal of this change is to unify tracing events styles
and add trace events for all RTP traffic.

BUG=1555
Review URL: https://webrtc-codereview.appspot.com/1290007

git-svn-id: http://webrtc.googlecode.com/svn/trunk@3806 4adac7df-926f-26a2-2b94-8c16560cd09d

webrtc/modules/video_coding/main/source/generic_encoder.cc

@@ -12,6 +12,7 @@
 #include "generic_encoder.h"
 #include "media_optimization.h"
 #include "../../../../engine_configurations.h"
+#include "trace_event.h"
 
 namespace webrtc {
 
@@ -177,6 +178,8 @@ VCMEncodedFrameCallback::Encoded(
     const CodecSpecificInfo* codecSpecificInfo,
     const RTPFragmentationHeader* fragmentationHeader)
 {
+    TRACE_EVENT2("webrtc", "VCM::Encoded", "timestamp", encodedImage._timeStamp,
+                 "length", encodedImage._length);
     FrameType frameType = VCMEncodedFrame::ConvertFrameType(encodedImage._frameType);
 
     uint32_t encodedBytes = 0;