Lift dynamic prop merging to ConcreteComponentDescriptor (#48939)

Summary:

The `enableAccumulatedUpdatesInRawPropsAndroid` experiment needs additional context for finer setup. Specifically it needs to be conditionally enabled based on a component name. This information is not accessible form the `Props` constructor.

This diff moves the experimental logic to `ConcreteComponentDescriptor`.

Changelog: [Internal]

Differential Revision: D68633985

packages/react-native/ReactCommon/react/renderer/core/ConcreteComponentDescriptor.h

@@ -20,6 +20,7 @@
 #include <react/renderer/core/ShadowNodeFragment.h>
 #include <react/renderer/core/State.h>
 #include <react/renderer/graphics/Float.h>
+#include "DynamicPropsUtilities.h"
 
 namespace facebook::react {
 
@@ -112,6 +113,16 @@ class ConcreteComponentDescriptor : public ComponentDescriptor {
       ShadowNodeT::filterRawProps(rawProps);
     }
 
+#ifdef ANDROID
+    if (ReactNativeFeatureFlags::enableAccumulatedUpdatesInRawPropsAndroid()) {
+      auto& oldDynamicProps = props->dynamicProps;
+      auto newDynamicProps = rawProps.toDynamic();
+      auto mergedDynamicProps = mergeDynamicProps(
+          oldDynamicProps, newDynamicProps, NullValueStrategy::Override);
+      rawProps = RawProps{mergedDynamicProps};
+    }
+#endif
+
     rawProps.parse(rawPropsParser_);
 
     auto shadowNodeProps = ShadowNodeT::Props(context, rawProps, props);

packages/react-native/ReactCommon/react/renderer/core/Props.cpp

@@ -10,7 +10,6 @@
 #include <react/renderer/core/propsConversions.h>
 
 #include <react/featureflags/ReactNativeFeatureFlags.h>
-#include "DynamicPropsUtilities.h"
 
 namespace facebook::react {
 
@@ -32,15 +31,7 @@ void Props::initialize(
       ? sourceProps.nativeId
       : convertRawProp(context, rawProps, "nativeID", sourceProps.nativeId, {});
 #ifdef ANDROID
-  if (ReactNativeFeatureFlags::enableAccumulatedUpdatesInRawPropsAndroid()) {
-    auto& oldDynamicProps = sourceProps.dynamicProps;
-    auto newDynamicProps = rawProps.toDynamic(filterObjectKeys);
-    auto mergedDynamicProps = mergeDynamicProps(
-        oldDynamicProps, newDynamicProps, NullValueStrategy::Override);
-    this->dynamicProps = mergedDynamicProps;
-  } else {
-    this->dynamicProps = rawProps.toDynamic(filterObjectKeys);
-  }
+  this->dynamicProps = rawProps.toDynamic(filterObjectKeys);
 #endif
 }