[NOT FOR REVIEW] Instrument net/ with trace events.

net/cert/cert_verify_proc.cc

Index: net/cert/cert_verify_proc.cc
diff --git a/net/cert/cert_verify_proc.cc b/net/cert/cert_verify_proc.cc
index 1c9dede7d85c5aa2b3c5e53b420003f2e5b15456..6c5651d8ffd36afa4490649c316dd4f0a4c5b872 100644
--- a/net/cert/cert_verify_proc.cc
+++ b/net/cert/cert_verify_proc.cc
@@ -26,6 +26,8 @@
 #include "net/cert/x509_certificate.h"
 #include "url/url_canon.h"
 
+#include "base/trace_event/trace_event.h"
+
 #if defined(USE_NSS_CERTS) || defined(OS_IOS)
 #include "net/cert/cert_verify_proc_nss.h"
 #elif defined(USE_OPENSSL_CERTS) && !defined(OS_ANDROID)
@@ -229,6 +231,7 @@ int CertVerifyProc::Verify(X509Certificate* cert,
                            CRLSet* crl_set,
                            const CertificateList& additional_trust_anchors,
                            CertVerifyResult* verify_result) {
+  TRACE_EVENT0("net", "net::CertVerifyProc::Verify");
   verify_result->Reset();
   verify_result->verified_cert = cert;