add timestamps to determine string convert time

Reviewed By: astreet

Differential Revision: D2684174

fb-gh-sync-id: feed759025e131fd913c6188f783d6920ad1839c

ReactAndroid/src/main/jni/react/JSCExecutor.cpp

@@ -10,6 +10,7 @@
 #include <folly/String.h>
 #include <jni/fbjni/Exceptions.h>
 #include "Value.h"
+#include "jni/OnLoad.h"
 
 #ifdef WITH_JSC_EXTRA_TRACING
 #include <react/JSCTracing.h>
@@ -96,7 +97,19 @@ JSCExecutor::~JSCExecutor() {
 void JSCExecutor::executeApplicationScript(
     const std::string& script,
     const std::string& sourceURL) {
+  JNIEnv* env = Environment::current();
+  jclass markerClass = env->FindClass("com/facebook/react/bridge/ReactMarker");
+  jmethodID logMarkerMethod = facebook::react::getLogMarkerMethod();
+  jstring startStringMarker = env->NewStringUTF("executeApplicationScript_startStringConvert");
+  jstring endStringMarker = env->NewStringUTF("executeApplicationScript_endStringConvert");
+
+  env->CallStaticVoidMethod(markerClass, logMarkerMethod, startStringMarker);
   String jsScript(script.c_str());
+  env->CallStaticVoidMethod(markerClass, logMarkerMethod, endStringMarker);
+
+  env->DeleteLocalRef(startStringMarker);
+  env->DeleteLocalRef(endStringMarker);
+
   String jsSourceURL(sourceURL.c_str());
   #ifdef WITH_FBSYSTRACE
   FbSystraceSection s(TRACE_TAG_REACT_CXX_BRIDGE, "JSCExecutor::executeApplicationScript",

ReactAndroid/src/main/jni/react/jni/OnLoad.cpp

@@ -16,6 +16,7 @@
 #include "JSLoader.h"
 #include "ReadableNativeArray.h"
 #include "ProxyExecutor.h"
+#include "OnLoad.h"
 
 #ifdef WITH_FBSYSTRACE
 #include <fbsystrace.h>
@@ -747,6 +748,10 @@ static void createProxyExecutor(JNIEnv *env, jobject obj, jobject executorInstan
 
 }
 
+jmethodID getLogMarkerMethod() {
+  return bridge::gLogMarkerMethod;
+}
+
 extern "C" JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved) {
   return initialize(vm, [] {
     // get the current env

ReactAndroid/src/main/jni/react/jni/OnLoad.h

@@ -0,0 +1,13 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#pragma once
+
+#include <jni.h>
+
+namespace facebook {
+namespace react {
+
+jmethodID getLogMarkerMethod();
+
+} // namespace react
+} // namespace facebook