Ensure PipTransitionController initializes in order

- This is the only transition controller that isn't using ShellInit,
  which means that it currently adds itself as a handler too early.

Bug: 238217847
Test: atest PinnedStackTests
Test: atest WMShellFlickerTests:com.android.wm.shell.flicker.pip.AutoEnterPipOnGoToHomeTest
Change-Id: Ia6dd437d52b8e7f249c86ed4b013fcbf04c31265

libs/WindowManager/Shell/src/com/android/wm/shell/dagger/TvPipModule.java

@@ -49,6 +49,7 @@ import com.android.wm.shell.pip.tv.TvPipTaskOrganizer;
 import com.android.wm.shell.pip.tv.TvPipTransition;
 import com.android.wm.shell.splitscreen.SplitScreenController;
 import com.android.wm.shell.sysui.ShellController;
+import com.android.wm.shell.sysui.ShellInit;
 import com.android.wm.shell.transition.Transitions;
 
 import java.util.Optional;
@@ -138,12 +139,14 @@ public abstract class TvPipModule {
     @WMSingleton
     @Provides
     static PipTransitionController provideTvPipTransition(
-            Transitions transitions, ShellTaskOrganizer shellTaskOrganizer,
+            ShellInit shellInit,
+            ShellTaskOrganizer shellTaskOrganizer,
+            Transitions transitions,
             PipAnimationController pipAnimationController,
             TvPipBoundsAlgorithm tvPipBoundsAlgorithm,
             TvPipBoundsState tvPipBoundsState, TvPipMenuController pipMenuController) {
-        return new TvPipTransition(tvPipBoundsState, pipMenuController,
-                tvPipBoundsAlgorithm, pipAnimationController, transitions, shellTaskOrganizer);
+        return new TvPipTransition(shellInit, shellTaskOrganizer, transitions, tvPipBoundsState,
+                pipMenuController, tvPipBoundsAlgorithm, pipAnimationController);
     }
 
     @WMSingleton

libs/WindowManager/Shell/src/com/android/wm/shell/dagger/WMShellModule.java

@@ -409,15 +409,15 @@ public abstract class WMShellModule {
     @WMSingleton
     @Provides
     static PipTransitionController providePipTransitionController(Context context,
-            Transitions transitions, ShellTaskOrganizer shellTaskOrganizer,
+            ShellInit shellInit, ShellTaskOrganizer shellTaskOrganizer, Transitions transitions,
             PipAnimationController pipAnimationController, PipBoundsAlgorithm pipBoundsAlgorithm,
             PipBoundsState pipBoundsState, PipTransitionState pipTransitionState,
             PhonePipMenuController pipMenuController,
             PipSurfaceTransactionHelper pipSurfaceTransactionHelper,
             Optional<SplitScreenController> splitScreenOptional) {
-        return new PipTransition(context, pipBoundsState, pipTransitionState, pipMenuController,
-                pipBoundsAlgorithm, pipAnimationController, transitions, shellTaskOrganizer,
-                pipSurfaceTransactionHelper, splitScreenOptional);
+        return new PipTransition(context, shellInit, shellTaskOrganizer, transitions,
+                pipBoundsState, pipTransitionState, pipMenuController, pipBoundsAlgorithm,
+                pipAnimationController, pipSurfaceTransactionHelper, splitScreenOptional);
     }
 
     @WMSingleton

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

@@ -66,6 +66,7 @@ import com.android.wm.shell.R;
 import com.android.wm.shell.ShellTaskOrganizer;
 import com.android.wm.shell.protolog.ShellProtoLogGroup;
 import com.android.wm.shell.splitscreen.SplitScreenController;
+import com.android.wm.shell.sysui.ShellInit;
 import com.android.wm.shell.transition.CounterRotatorHelper;
 import com.android.wm.shell.transition.Transitions;
 
@@ -107,17 +108,18 @@ public class PipTransition extends PipTransitionController {
     private boolean mHasFadeOut;
 
     public PipTransition(Context context,
+            @NonNull ShellInit shellInit,
+            @NonNull ShellTaskOrganizer shellTaskOrganizer,
+            @NonNull Transitions transitions,
             PipBoundsState pipBoundsState,
             PipTransitionState pipTransitionState,
             PipMenuController pipMenuController,
             PipBoundsAlgorithm pipBoundsAlgorithm,
             PipAnimationController pipAnimationController,
-            Transitions transitions,
-            @NonNull ShellTaskOrganizer shellTaskOrganizer,
             PipSurfaceTransactionHelper pipSurfaceTransactionHelper,
             Optional<SplitScreenController> splitScreenOptional) {
-        super(pipBoundsState, pipMenuController, pipBoundsAlgorithm,
-                pipAnimationController, transitions, shellTaskOrganizer);
+        super(shellInit, shellTaskOrganizer, transitions, pipBoundsState, pipMenuController,
+                pipBoundsAlgorithm, pipAnimationController);
         mContext = context;
         mPipTransitionState = pipTransitionState;
         mEnterExitAnimationDuration = context.getResources()

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

@@ -38,6 +38,7 @@ import android.window.WindowContainerTransaction;
 import androidx.annotation.NonNull;
 
 import com.android.wm.shell.ShellTaskOrganizer;
+import com.android.wm.shell.sysui.ShellInit;
 import com.android.wm.shell.transition.Transitions;
 
 import java.util.ArrayList;
@@ -131,10 +132,13 @@ public abstract class PipTransitionController implements Transitions.TransitionH
     public void onFixedRotationStarted() {
     }
 
-    public PipTransitionController(PipBoundsState pipBoundsState,
+    public PipTransitionController(
+            @NonNull ShellInit shellInit,
+            @NonNull ShellTaskOrganizer shellTaskOrganizer,
+            @NonNull Transitions transitions,
+            PipBoundsState pipBoundsState,
             PipMenuController pipMenuController, PipBoundsAlgorithm pipBoundsAlgorithm,
-            PipAnimationController pipAnimationController, Transitions transitions,
-            @android.annotation.NonNull ShellTaskOrganizer shellTaskOrganizer) {
+            PipAnimationController pipAnimationController) {
         mPipBoundsState = pipBoundsState;
         mPipMenuController = pipMenuController;
         mShellTaskOrganizer = shellTaskOrganizer;
@@ -142,10 +146,14 @@ public abstract class PipTransitionController implements Transitions.TransitionH
         mPipAnimationController = pipAnimationController;
         mTransitions = transitions;
         if (Transitions.ENABLE_SHELL_TRANSITIONS) {
-            transitions.addHandler(this);
+            shellInit.addInitCallback(this::onInit, this);
         }
     }
 
+    private void onInit() {
+        mTransitions.addHandler(this);
+    }
+
     void setPipOrganizer(PipTaskOrganizer pto) {
         mPipOrganizer = pto;
     }

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

@@ -32,6 +32,7 @@ import com.android.wm.shell.pip.PipAnimationController;
 import com.android.wm.shell.pip.PipBoundsState;
 import com.android.wm.shell.pip.PipMenuController;
 import com.android.wm.shell.pip.PipTransitionController;
+import com.android.wm.shell.sysui.ShellInit;
 import com.android.wm.shell.transition.Transitions;
 
 /**
@@ -39,14 +40,16 @@ import com.android.wm.shell.transition.Transitions;
  * TODO: Implement animation once TV is using Transitions.
  */
 public class TvPipTransition extends PipTransitionController {
-    public TvPipTransition(PipBoundsState pipBoundsState,
+    public TvPipTransition(
+            @NonNull ShellInit shellInit,
+            @NonNull ShellTaskOrganizer shellTaskOrganizer,
+            @NonNull Transitions transitions,
+            PipBoundsState pipBoundsState,
             PipMenuController pipMenuController,
             TvPipBoundsAlgorithm tvPipBoundsAlgorithm,
-            PipAnimationController pipAnimationController,
-            Transitions transitions,
-            @NonNull ShellTaskOrganizer shellTaskOrganizer) {
-        super(pipBoundsState, pipMenuController, tvPipBoundsAlgorithm, pipAnimationController,
-                transitions, shellTaskOrganizer);
+            PipAnimationController pipAnimationController) {
+        super(shellInit, shellTaskOrganizer, transitions, pipBoundsState, pipMenuController,
+                tvPipBoundsAlgorithm, pipAnimationController);
     }
 
     @Override

libs/WindowManager/Shell/src/com/android/wm/shell/transition/Transitions.java

@@ -158,9 +158,11 @@ public class Transitions implements RemoteCallable<Transitions> {
 
     private void onInit() {
         // The very last handler (0 in the list) should be the default one.
-        mHandlers.add(0, mDefaultTransitionHandler);
+        mHandlers.add(mDefaultTransitionHandler);
+        ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "addHandler: Default");
         // Next lowest priority is remote transitions.
-        mHandlers.add(1, mRemoteTransitionHandler);
+        mHandlers.add(mRemoteTransitionHandler);
+        ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "addHandler: Remote");
 
         ContentResolver resolver = mContext.getContentResolver();
         mTransitionAnimationScaleSetting = Settings.Global.getFloat(resolver,
@@ -206,7 +208,13 @@ public class Transitions implements RemoteCallable<Transitions> {
      * @see TransitionHandler
      */
     public void addHandler(@NonNull TransitionHandler handler) {
+        if (mHandlers.isEmpty()) {
+            throw new RuntimeException("Unexpected handler added prior to initialization, please "
+                    + "use ShellInit callbacks to ensure proper ordering");
+        }
         mHandlers.add(handler);
+        ProtoLog.v(ShellProtoLogGroup.WM_SHELL_TRANSITIONS, "addHandler: %s",
+                handler.getClass().getSimpleName());
     }
 
     public ShellExecutor getMainExecutor() {