Post view-drawing so that it happens after applying start transaction

These views were drawing before the transition startTransaction is
applied. This can cause deadlocks if there aren't enough buffers
and the view blocks the thread since applying the transaction is
what frees-up the buffers.

Bug: 233625646
Test: run tests and check for fewer ANRs
Change-Id: I7d592fe186695cdcde040d4ec315e656e05354e5

libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTaskOrganizer.java

@@ -942,7 +942,7 @@ public class PipTaskOrganizer implements ShellTaskOrganizer.TaskListener,
         // Re-set the PIP bounds to none.
         mPipBoundsState.setBounds(new Rect());
         mPipUiEventLoggerLogger.setTaskInfo(null);
-        mPipMenuController.detach();
+        mMainExecutor.executeDelayed(() -> mPipMenuController.detach(), 0);
 
         if (info.displayId != Display.DEFAULT_DISPLAY && mOnDisplayIdChangeCallback != null) {
             mOnDisplayIdChangeCallback.accept(Display.DEFAULT_DISPLAY);

libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTransition.java

@@ -715,7 +715,7 @@ public class PipTransition extends PipTransitionController {
         mSurfaceTransactionHelper
                 .crop(finishTransaction, leash, destinationBounds)
                 .round(finishTransaction, leash, true /* applyCornerRadius */);
-        mPipMenuController.attach(leash);
+        mTransitions.getMainExecutor().executeDelayed(() -> mPipMenuController.attach(leash), 0);
 
         if (taskInfo.pictureInPictureParams != null
                 && taskInfo.pictureInPictureParams.isAutoEnterEnabled()

libs/WindowManager/Shell/src/com/android/wm/shell/pip/PipTransitionController.java

@@ -28,9 +28,7 @@ import android.app.TaskInfo;
 import android.content.ComponentName;
 import android.content.pm.ActivityInfo;
 import android.graphics.Rect;
-import android.os.Handler;
 import android.os.IBinder;
-import android.os.Looper;
 import android.view.SurfaceControl;
 import android.view.WindowManager;
 import android.window.TransitionInfo;
@@ -56,7 +54,6 @@ public abstract class PipTransitionController implements Transitions.TransitionH
     protected final ShellTaskOrganizer mShellTaskOrganizer;
     protected final PipMenuController mPipMenuController;
     protected final Transitions mTransitions;
-    private final Handler mMainHandler;
     private final List<PipTransitionCallback> mPipTransitionCallbacks = new ArrayList<>();
     protected PipTaskOrganizer mPipOrganizer;
 
@@ -144,7 +141,6 @@ public abstract class PipTransitionController implements Transitions.TransitionH
         mPipBoundsAlgorithm = pipBoundsAlgorithm;
         mPipAnimationController = pipAnimationController;
         mTransitions = transitions;
-        mMainHandler = new Handler(Looper.getMainLooper());
         if (Transitions.ENABLE_SHELL_TRANSITIONS) {
             transitions.addHandler(this);
         }