Use sampling profile serializer and emit profiles in traces (facebook#48315)

Summary:
Pull Request resolved: facebook#48315

# Changelog: [Internal]

> NOTE: Some CI jobs are expected to fail, because changes in Hermes D67353585 should be landed first, and then grafted to Static Hermes.

Use newly added serializer and record Trace Events for profiles.

Reviewed By: huntie

Differential Revision: D67353586

fbshipit-source-id: f3738418ec1d47ef4435f00120823845ea5e2fe5

Author: hoxyq

packages/react-native/ReactCommon/jsinspector-modern/TracingAgent.cpp

@@ -8,6 +8,7 @@
 #include "TracingAgent.h"
 
 #include <jsinspector-modern/tracing/PerformanceTracer.h>
+#include <jsinspector-modern/tracing/RuntimeSamplingProfileTraceEventSerializer.h>
 
 namespace facebook::react::jsinspector_modern {
 
@@ -46,6 +47,7 @@ bool TracingAgent::handleRequest(const cdp::PreparsedRequest& req) {
     }
 
     instanceAgent_->startTracing();
+    instanceTracingStartTimestamp_ = std::chrono::steady_clock::now();
     frontendChannel_(cdp::jsonResult(req.id));
 
     return true;
@@ -60,6 +62,10 @@ bool TracingAgent::handleRequest(const cdp::PreparsedRequest& req) {
       return true;
     }
     instanceAgent_->stopTracing();
+    tracing::RuntimeSamplingProfileTraceEventSerializer::serializeAndBuffer(
+        PerformanceTracer::getInstance(),
+        instanceAgent_->collectTracingProfile().getRuntimeSamplingProfile(),
+        instanceTracingStartTimestamp_);
 
     bool correctlyStopped = PerformanceTracer::getInstance().stopTracing();
     if (!correctlyStopped) {

packages/react-native/ReactCommon/jsinspector-modern/TracingAgent.h

@@ -50,6 +50,12 @@ class TracingAgent {
    * currently no active instance.
    */
   std::shared_ptr<InstanceAgent> instanceAgent_;
+
+  /**
+   * Timestamp of when we started tracing of an Instance, will be used as a
+   * a start of JavaScript samples recording.
+   */
+  std::chrono::steady_clock::time_point instanceTracingStartTimestamp_;
 };
 
 } // namespace facebook::react::jsinspector_modern