add perf marker that fires first time content is added to root view

Reviewed By: javache

Differential Revision: D5582838

fbshipit-source-id: f90376ab11b4d44c002759829e4b2bbb4bbeeb56

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

@@ -9,7 +9,7 @@
 
 package com.facebook.react;
 
-import javax.annotation.Nullable;
+import static com.facebook.systrace.Systrace.TRACE_TAG_REACT_JAVA_BRIDGE;
 
 import android.content.Context;
 import android.graphics.Rect;
@@ -23,12 +23,13 @@
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.view.WindowManager;
-
 import com.facebook.common.logging.FLog;
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.CatalystInstance;
 import com.facebook.react.bridge.ReactContext;
+import com.facebook.react.bridge.ReactMarker;
+import com.facebook.react.bridge.ReactMarkerConstants;
 import com.facebook.react.bridge.UiThreadUtil;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.bridge.WritableNativeMap;
@@ -45,8 +46,7 @@
 import com.facebook.react.uimanager.UIManagerModule;
 import com.facebook.react.uimanager.events.EventDispatcher;
 import com.facebook.systrace.Systrace;
-
-import static com.facebook.systrace.Systrace.TRACE_TAG_REACT_JAVA_BRIDGE;
+import javax.annotation.Nullable;
 
 /**
  * Default root view for catalyst apps. Provides the ability to listen for size changes so that a UI
@@ -81,6 +81,7 @@ public interface ReactRootViewEventListener {
   private @Nullable ReactRootViewEventListener mRootViewEventListener;
   private int mRootViewTag;
   private boolean mIsAttachedToInstance;
+  private boolean mContentAppeared;
   private final JSTouchDispatcher mJSTouchDispatcher = new JSTouchDispatcher(this);
 
   public ReactRootView(Context context) {
@@ -190,6 +191,24 @@ protected void onDetachedFromWindow() {
     }
   }
 
+  @Override
+  public void onViewAdded(View child) {
+    super.onViewAdded(child);
+
+    if (!mContentAppeared) {
+      mContentAppeared = true;
+      ReactMarker.logMarker(
+          ReactMarkerConstants.CONTENT_APPEARED, getJSModuleName(), getRootViewTag());
+    }
+  }
+
+  @Override
+  public void removeAllViewsInLayout() {
+    super.removeAllViewsInLayout();
+
+    mContentAppeared = false;
+  }
+
   /**
    * {@see #startReactApplication(ReactInstanceManager, String, android.os.Bundle)}
    */

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

@@ -66,4 +66,5 @@ public enum ReactMarkerConstants {
   PRE_RUN_JS_BUNDLE_START,
   ATTACH_MEASURED_ROOT_VIEWS_START,
   ATTACH_MEASURED_ROOT_VIEWS_END,
+  CONTENT_APPEARED,
 }