loosen the ReactChoreographer UI thread assert

Reviewed By: achen1

Differential Revision: D4873553

fbshipit-source-id: 7dbf771e744f6b33e6edb3ad4c227c3a63c3e3e3

ReactAndroid/src/androidTest/java/com/facebook/react/testing/ReactTestHelper.java

@@ -31,6 +31,7 @@ import com.facebook.react.cxxbridge.CatalystInstanceImpl;
 import com.facebook.react.cxxbridge.JSBundleLoader;
 import com.facebook.react.cxxbridge.JSCJavaScriptExecutor;
 import com.facebook.react.cxxbridge.JavaScriptExecutor;
+import com.facebook.react.modules.core.ReactChoreographer;
 
 import com.android.internal.util.Predicate;
 
@@ -153,6 +154,7 @@ public class ReactTestHelper {
           InstrumentationRegistry.getInstrumentation().runOnMainSync(new Runnable() {
             @Override
             public void run() {
+              ReactChoreographer.initialize();
               instance.initialize();
             }
           });

ReactAndroid/src/main/java/com/facebook/react/ReactInstanceManager.java

@@ -61,6 +61,7 @@ import com.facebook.react.devsupport.interfaces.PackagerStatusCallback;
 import com.facebook.react.modules.appregistry.AppRegistry;
 import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
 import com.facebook.react.modules.core.DeviceEventManagerModule;
+import com.facebook.react.modules.core.ReactChoreographer;
 import com.facebook.react.modules.debug.interfaces.DeveloperSettings;
 import com.facebook.react.uimanager.DisplayMetricsHolder;
 import com.facebook.react.uimanager.UIImplementationProvider;
@@ -348,6 +349,9 @@ public class ReactInstanceManager {
     mLazyNativeModulesEnabled = lazyNativeModulesEnabled;
     mLazyViewManagersEnabled = lazyViewManagersEnabled;
     mUseStartupThread = useStartupThread;
+
+    // Instantiate ReactChoreographer in UI thread.
+    ReactChoreographer.initialize();
   }
 
   public DevSupportManager getDevSupportManager() {

ReactAndroid/src/main/java/com/facebook/react/modules/core/ReactChoreographer.java

@@ -12,8 +12,8 @@ package com.facebook.react.modules.core;
 import java.util.ArrayDeque;
 
 import com.facebook.common.logging.FLog;
-import com.facebook.react.bridge.UiThreadUtil;
 import com.facebook.infer.annotation.Assertions;
+import com.facebook.react.bridge.UiThreadUtil;
 import com.facebook.react.common.ReactConstants;
 
 /**
@@ -65,11 +65,15 @@ public class ReactChoreographer {
 
   private static ReactChoreographer sInstance;
 
-  public static ReactChoreographer getInstance() {
+  public static void initialize() {
-    UiThreadUtil.assertOnUiThread();
     if (sInstance == null) {
+      UiThreadUtil.assertOnUiThread();
       sInstance = new ReactChoreographer();
     }
+  }
+
+  public static ReactChoreographer getInstance() {
+    Assertions.assertNotNull(sInstance, "ReactChoreographer needs to be initialized.");
     return sInstance;
   }
 
@@ -89,8 +93,9 @@ public class ReactChoreographer {
     }
   }
 
-  public void postFrameCallback(CallbackType type, ChoreographerCompat.FrameCallback frameCallback) {
+  public synchronized void postFrameCallback(
-    UiThreadUtil.assertOnUiThread();
+    CallbackType type,
+    ChoreographerCompat.FrameCallback frameCallback) {
     mCallbackQueues[type.getOrder()].addLast(frameCallback);
     mTotalCallbacks++;
     Assertions.assertCondition(mTotalCallbacks > 0);
@@ -100,8 +105,9 @@ public class ReactChoreographer {
     }
   }
 
-  public void removeFrameCallback(CallbackType type, ChoreographerCompat.FrameCallback frameCallback) {
+  public synchronized void removeFrameCallback(
-    UiThreadUtil.assertOnUiThread();
+    CallbackType type,
+    ChoreographerCompat.FrameCallback frameCallback) {
     if (mCallbackQueues[type.getOrder()].removeFirstOccurrence(frameCallback)) {
       mTotalCallbacks--;
       maybeRemoveFrameCallback();
@@ -122,6 +128,7 @@ public class ReactChoreographer {
 
     @Override
     public void doFrame(long frameTimeNanos) {
+      synchronized (ReactChoreographer.this) {
         mHasPostedCallback = false;
         for (int i = 0; i < mCallbackQueues.length; i++) {
           int initialLength = mCallbackQueues[i].size();
@@ -134,3 +141,4 @@ public class ReactChoreographer {
       }
     }
   }
+}