Add a flag for printf debugging the compiler dispatcher

src/compiler-dispatcher/compiler-dispatcher-tracer.cc

Index: src/compiler-dispatcher/compiler-dispatcher-tracer.cc
diff --git a/src/compiler-dispatcher/compiler-dispatcher-tracer.cc b/src/compiler-dispatcher/compiler-dispatcher-tracer.cc
index 310420a0d51e8d5cae09c0138d3c0c7c0c4ed592..0703e016e98a62984b5e53bfe621832fbc929441 100644
--- a/src/compiler-dispatcher/compiler-dispatcher-tracer.cc
+++ b/src/compiler-dispatcher/compiler-dispatcher-tracer.cc
@@ -5,6 +5,7 @@
 #include "src/compiler-dispatcher/compiler-dispatcher-tracer.h"
 
 #include "src/isolate.h"
+#include "src/utils.h"
 
 namespace v8 {
 namespace internal {
@@ -143,6 +144,17 @@ double CompilerDispatcherTracer::EstimateFinalizeCompilingInMs() const {
   return Average(finalize_compiling_events_);
 }
 
+void CompilerDispatcherTracer::DumpStatistics() const {
+  PrintF(
+      "CompilerDispatcherTracer: "
+      "prepare_parsing=%.2lfms parsing=%.2lfms/kb finalize_parsing=%.2lfms "
+      "prepare_compiling=%.2lfms compiling=%.2lfms/kb "
+      "finalize_compilig=%.2lfms\n",
+      EstimatePrepareToParseInMs(), EstimateParseInMs(1 * KB),
+      EstimateFinalizeParsingInMs(), EstimatePrepareToCompileInMs(),
+      EstimateCompileInMs(1 * KB), EstimateFinalizeCompilingInMs());
+}
+
 double CompilerDispatcherTracer::Average(
     const base::RingBuffer<double>& buffer) {
   if (buffer.Count() == 0) return 0.0;