Expose Hermes Sampling Profiler in default react native templates

Reviewed By: yinghuitan

Differential Revision: D8063912

fbshipit-source-id: bc894762223c552abcb9151f702476cf333c059c

Author: axe-fb

ReactAndroid/src/main/java/com/facebook/hermes/reactexecutor/HermesExecutorFactory.java

@@ -6,6 +6,7 @@
  */
 package com.facebook.hermes.reactexecutor;
 
+import com.facebook.hermes.instrumentation.HermesSamplingProfiler;
 import com.facebook.react.bridge.JavaScriptExecutor;
 import com.facebook.react.bridge.JavaScriptExecutorFactory;
 
@@ -28,10 +29,15 @@ public JavaScriptExecutor create() {
   }
 
   @Override
-  public void startSamplingProfiler() {}
+  public void startSamplingProfiler() {
+    HermesSamplingProfiler.enable();
+  }
 
   @Override
-  public void stopSamplingProfiler(String filename) {}
+  public void stopSamplingProfiler(String filename) {
+    HermesSamplingProfiler.dumpSampledTraceToFile(filename);
+    HermesSamplingProfiler.disable();
+  }
 
   @Override
   public String toString() {