Backout 981069:cb671e39fd64 breaking master

fb-gh-sync-id: 052d4aab3722d44f5c4fbb0f4f50a2d71ba56927

ReactAndroid/src/main/java/com/facebook/react/uimanager/OnLayoutEvent.java

@@ -9,9 +9,6 @@
 
 package com.facebook.react.uimanager;
 
-import android.os.SystemClock;
-import android.support.v4.util.Pools;
-
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.uimanager.events.Event;
@@ -22,30 +19,10 @@ import com.facebook.react.uimanager.events.RCTEventEmitter;
  */
 /* package */ class OnLayoutEvent extends Event<OnLayoutEvent> {
 
-  private static final Pools.SynchronizedPool<OnLayoutEvent> EVENTS_POOL =
-      new Pools.SynchronizedPool<>(20);
+  private final int mX, mY, mWidth, mHeight;
 
-  private int mX, mY, mWidth, mHeight;
-
-  public static OnLayoutEvent obtain(int viewTag, int x, int y, int width, int height) {
-    OnLayoutEvent event = EVENTS_POOL.acquire();
-    if (event == null) {
-      event = new OnLayoutEvent();
-    }
-    event.init(viewTag, x, y, width, height);
-    return event;
-  }
-
-  @Override
-  public void onDispose() {
-    EVENTS_POOL.release(this);
-  }
-
-  private OnLayoutEvent() {
-  }
-
-  protected void init(int viewTag, int x, int y, int width, int height) {
-    super.init(viewTag, SystemClock.uptimeMillis());
+  protected OnLayoutEvent(int viewTag, int x, int y, int width, int height) {
+    super(viewTag, 0);
     mX = x;
     mY = y;
     mWidth = width;

ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModule.java

@@ -806,7 +806,7 @@ public class UIManagerModule extends ReactContextBaseJavaModule implements
       // notify JS about layout event if requested
       if (cssNode.shouldNotifyOnLayout()) {
         mEventDispatcher.dispatchEvent(
-            OnLayoutEvent.obtain(
+            new OnLayoutEvent(
                 tag,
                 cssNode.getScreenX(),
                 cssNode.getScreenY(),

ReactAndroid/src/main/java/com/facebook/react/uimanager/events/Event.java

@@ -11,31 +11,15 @@ package com.facebook.react.uimanager.events;
 
 /**
  * A UI event that can be dispatched to JS.
- *
- * For dispatching events {@link EventDispatcher#dispatchEvent} should be used. Once event object
- * is passed to the EventDispatched it should no longer be used as EventDispatcher may decide
- * to recycle that object (by calling {@link #dispose}).
  */
 public abstract class Event<T extends Event> {
 
-  private boolean mInitialized;
-  private int mViewTag;
-  private long mTimestampMs;
-
-  protected Event() {
-  }
+  private final int mViewTag;
+  private final long mTimestampMs;
 
   protected Event(int viewTag, long timestampMs) {
-    init(viewTag, timestampMs);
-  }
-
-  /**
-   * This method needs to be called before event is sent to event dispatcher.
-   */
-  protected void init(int viewTag, long timestampMs) {
     mViewTag = viewTag;
     mTimestampMs = timestampMs;
-    mInitialized = true;
   }
 
   /**
@@ -84,16 +68,7 @@ public abstract class Event<T extends Event> {
    * Called when the EventDispatcher is done with an event, either because it was dispatched or
    * because it was coalesced with another Event.
    */
-  public void onDispose() {
-  }
-
-  /*package*/ boolean isInitialized() {
-    return mInitialized;
-  }
-
-  /*package*/ final void dispose() {
-    mInitialized = false;
-    onDispose();
+  public void dispose() {
   }
 
   /**

ReactAndroid/src/main/java/com/facebook/react/uimanager/events/EventDispatcher.java

@@ -110,7 +110,6 @@ public class EventDispatcher implements LifecycleEventListener {
    * Sends the given Event to JS, coalescing eligible events if JS is backed up.
    */
   public void dispatchEvent(Event event) {
-    Assertions.assertCondition(event.isInitialized(), "Dispatched event hasn't been initialized");
     synchronized (mEventsStagingLock) {
       mEventStaging.add(event);
     }

ReactAndroid/src/main/java/com/facebook/react/uimanager/events/TouchEvent.java

@@ -96,7 +96,7 @@ public class TouchEvent extends Event<TouchEvent> {
   }
 
   @Override
-  public void onDispose() {
+  public void dispose() {
     mMotionEvent.recycle();
   }
 }