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focus on:
applyAnimations(openingWcs, openingApps, transit, true /* visible */, animLp,
voiceInteraction);

SurfaceAnimator

mSurfaceAnimator.startAnimation

windowEnterAnimation

// applyAnimations(openingWcs, openingApps, transit, true /* visible /, animLp,
// voiceInteraction);
// applyAnimations(closingWcs, closingApps, transit, false / visible */, animLp,
// voiceInteraction);

WindowContainer: which window is animating now ?

 1. WindowContainer#startAnimation()
 2. SurfaceAnimator#startAnimation()

 1. WindowState#startAnimation()
 2. WindowStateAnimator#applyEnterAnimationLocked()

  void scheduleAnimationLocked() {
        mAnimator.scheduleAnimation();
    }
    
    
   void scheduleAnimation() {
        if (!mAnimationFrameCallbackScheduled) {
            mAnimationFrameCallbackScheduled = true;
            mChoreographer.postFrameCallback(mAnimationFrameCallback);
        }
    }
    
    
   mAnimationFrameCallback = frameTimeNs -> {
            synchronized (mService.mGlobalLock) {
                mAnimationFrameCallbackScheduled = false;
                final long vsyncId = mChoreographer.getVsyncId();
                animate(frameTimeNs, vsyncId);
                if (mNotifyWhenNoAnimation && !mLastRootAnimating) {
                    mService.mGlobalLock.notifyAll();
                }
            }
        };

  applyAnimations(mDisplayContent.mOpeningApps, mDisplayContent.mClosingApps, transit,
                    animLp, voiceInteraction);

finally calls :

SurfaceAnimationRunner#startAnimationLocked()
WindowAnimationSpec#apply()