public void onActivityEnterAnimationComplete() {
        mEnterAnimationComplete = true;
        if (mOnEnterAnimationCompleteRunnable != null) {
            mOnEnterAnimationCompleteRunnable.run();
            mOnEnterAnimationCompleteRunnable = null;
        }
    }
To be called from {@link Activity#onEnterAnimationComplete}.
customtabs/src/android/support/customtabs/trusted/splashscreens/PwaWrapperSplashScreenStrategy.java