Implement release of FabricUIManager resources

Reviewed By: achen1

Differential Revision: D8232155

fbshipit-source-id: 6683c692a830f5a73aab2c606167e54d668ae5c2

ReactAndroid/src/main/java/com/facebook/react/bridge/CatalystInstanceImpl.java

@@ -338,10 +338,14 @@ public class CatalystInstanceImpl implements CatalystInstance {
           @Override
           public void run() {
             mNativeModuleRegistry.notifyJSInstanceDestroy();
+            mJSIModuleRegistry.notifyJSInstanceDestroy();
             boolean wasIdle = (mPendingJSCalls.getAndSet(0) == 0);
-            if (!wasIdle && !mBridgeIdleListeners.isEmpty()) {
+            if (!mBridgeIdleListeners.isEmpty()) {
               for (NotThreadSafeBridgeIdleDebugListener listener : mBridgeIdleListeners) {
-                listener.onTransitionToBridgeIdle();
+                if (!wasIdle) {
+                  listener.onTransitionToBridgeIdle();
+                }
+                listener.onBridgeDestroyed();
               }
             }
             AsyncTask.execute(
@@ -351,7 +355,8 @@ public class CatalystInstanceImpl implements CatalystInstance {
                     // Kill non-UI threads from neutral third party
                     // potentially expensive, so don't run on UI thread
 
-                    // contextHolder is used as a lock to guard against other users of the JS VM having
+                    // contextHolder is used as a lock to guard against other users of the JS VM
+                    // having
                     // the VM destroyed underneath them, so notify them before we resetNative
                     mJavaScriptContextHolder.clear();