Implement JNI code to invoke Android JSResponder methods from C++

Summary: This diff implements the JNI code required for Android to receive JSResponderHandler calls

Reviewed By: JoshuaGross, makovkastar

Differential Revision: D16543431

fbshipit-source-id: 38cff16a05633fccefa201b189d761d503a9b839

ReactAndroid/src/main/java/com/facebook/react/fabric/jni/Binding.cpp

@@ -728,9 +728,36 @@ void Binding::schedulerDidSetJSResponder(
     SurfaceId surfaceId,
     const ShadowView &shadowView,
     const ShadowView &initialShadowView,
-    bool blockNativeResponder) { }
+    bool blockNativeResponder) {
 
-void Binding::schedulerDidClearJSResponder() { }
+  jni::global_ref<jobject> localJavaUIManager = getJavaUIManager();
+  if (!localJavaUIManager) {
+    LOG(ERROR) << "Binding::schedulerSetJSResponder: JavaUIManager disappeared";
+    return;
+  }
+
+  static auto setJSResponder =
+      jni::findClassStatic(UIManagerJavaDescriptor)
+          ->getMethod<void(
+              jint, jint, jboolean)>(
+              "setJSResponder");
+
+  setJSResponder(localJavaUIManager, shadowView.tag, initialShadowView.tag, (jboolean) blockNativeResponder);
+}
+
+void Binding::schedulerDidClearJSResponder() {
+  jni::global_ref<jobject> localJavaUIManager = getJavaUIManager();
+  if (!localJavaUIManager) {
+    LOG(ERROR) << "Binding::schedulerClearJSResponder: JavaUIManager disappeared";
+    return;
+  }
+
+  static auto clearJSResponder =
+      jni::findClassStatic(UIManagerJavaDescriptor)
+          ->getMethod<void()>("clearJSResponder");
+
+  clearJSResponder(localJavaUIManager);
+}
 
 void Binding::registerNatives() {
   registerHybrid(