Implement standalone event tracing in AppRTCDemo.

talk/app/webrtc/java/jni/peerconnection_jni.cc

Index: talk/app/webrtc/java/jni/peerconnection_jni.cc
diff --git a/talk/app/webrtc/java/jni/peerconnection_jni.cc b/talk/app/webrtc/java/jni/peerconnection_jni.cc
index 984227de45dc1ee1831018d6195b249b430ec066..46331e035f21397f746760e439ab7a6844916069 100644
--- a/talk/app/webrtc/java/jni/peerconnection_jni.cc
+++ b/talk/app/webrtc/java/jni/peerconnection_jni.cc
@@ -74,10 +74,11 @@
 #include "talk/media/webrtc/webrtcvideoencoderfactory.h"
 #include "webrtc/base/bind.h"
 #include "webrtc/base/checks.h"
+#include "webrtc/base/event_tracer.h"
 #include "webrtc/base/logging.h"
 #include "webrtc/base/logsinks.h"
-#include "webrtc/base/networkmonitor.h"
 #include "webrtc/base/messagequeue.h"
+#include "webrtc/base/networkmonitor.h"
 #include "webrtc/base/ssladapter.h"
 #include "webrtc/base/stringutils.h"
 #include "webrtc/system_wrappers/include/field_trial_default.h"
@@ -1054,6 +1055,34 @@ JOW(void, PeerConnectionFactory_initializeFieldTrials)(
   webrtc::field_trial::InitFieldTrialsFromString(field_trials_init_string);
 }
 
+JOW(void, PeerConnectionFactory_initializeInternalTracer)(
+    JNIEnv* jni, jclass) {
+  webrtc::EventTracer::SetupInternalTracer();
+}
+
+JOW(jboolean, PeerConnectionFactory_startInternalTracingCapture)(
+    JNIEnv* jni, jclass, jstring j_event_tracing_filename) {
+  if (j_event_tracing_filename == NULL)

[tommi, 2015/11/20 13:49:54]

nit: use |if (!ptr)| or |if (ptr == nullptr)|  I personally prefer the former.

[pbos-webrtc, 2015/11/20 15:11:05]

Done.

+    return false;
+
+  const char* init_string =
+      jni->GetStringUTFChars(j_event_tracing_filename, NULL);
+  LOG(LS_INFO) << "Starting internal tracing to: " << init_string;
+  bool ret = webrtc::EventTracer::StartInternalCapture(init_string);
+  jni->ReleaseStringUTFChars(j_event_tracing_filename, init_string);
+  return ret;
+}
+
+JOW(void, PeerConnectionFactory_stopInternalTracingCapture)(
+    JNIEnv* jni, jclass) {
+  webrtc::EventTracer::StopInternalCapture();
+}
+
+JOW(void, PeerConnectionFactory_shutdownInternalTracer)(
+    JNIEnv* jni, jclass) {
+  webrtc::EventTracer::ShutdownInternalTracer();
+}
+
 // Helper struct for working around the fact that CreatePeerConnectionFactory()
 // comes in two flavors: either entirely automagical (constructing its own
 // threads and deleting them on teardown, but no external codec factory support)