Add some additional Systrace markers in Fabric (#37675)

Summary:
Pull Request resolved: #37675

Changelog: [Internal]

Reviewed By: rshest

Differential Revision: D46393554

fbshipit-source-id: 905097c82c96c7f627f1999f53b509ba0f434dd5

Author: rubennorte

packages/react-native/ReactAndroid/src/main/jni/react/fabric/FabricMountingManager.cpp

@@ -253,6 +253,8 @@ jni::local_ref<jobject> FabricMountingManager::getProps(
 
 void FabricMountingManager::executeMount(
     const MountingTransaction &transaction) {
+  SystraceSection section("FabricMountingManager::executeMount");
+
   std::lock_guard<std::recursive_mutex> lock(commitMutex_);
   auto finishTransactionStartTime = telemetryTimePointNow();
 

packages/react-native/ReactCommon/react/renderer/mounting/MountingCoordinator.cpp

@@ -15,6 +15,7 @@
 #include <condition_variable>
 
 #include <react/debug/react_native_assert.h>
+#include <react/renderer/debug/SystraceSection.h>
 #include <react/renderer/mounting/ShadowViewMutation.h>
 
 namespace facebook::react {
@@ -76,6 +77,8 @@ void MountingCoordinator::resetLatestRevision() const {
 
 std::optional<MountingTransaction> MountingCoordinator::pullTransaction()
     const {
+  SystraceSection section("MountingCoordinator::pullTransaction");
+
   std::lock_guard<std::mutex> lock(mutex_);
 
   auto transaction = std::optional<MountingTransaction>{};

packages/react-native/ReactCommon/react/renderer/uimanager/UIManager.cpp

@@ -633,6 +633,8 @@ RootShadowNode::Unshared UIManager::shadowTreeWillCommit(
     ShadowTree const &shadowTree,
     RootShadowNode::Shared const &oldRootShadowNode,
     RootShadowNode::Unshared const &newRootShadowNode) const {
+  SystraceSection s("UIManager::shadowTreeWillCommit");
+
   std::shared_lock lock(commitHookMutex_);
 
   auto resultRootShadowNode = newRootShadowNode;
@@ -656,6 +658,8 @@ void UIManager::shadowTreeDidFinishTransaction(
 }
 
 void UIManager::reportMount(SurfaceId surfaceId) const {
+  SystraceSection s("UIManager::reportMount");
+
   auto time = JSExecutor::performanceNow();
 
   auto rootShadowNode = RootShadowNode::Shared{};