Fix AlwaysOnTop stack may covered by RemoteAnimation

Now with hierarachical animation, the layer of
RecentsAnimation / RemoteAnimation are controlled by system.

Now Launcher side don't need to have other way to set layer for ZBoost
case, so remove setLayer & withLayer related logics for cleaning up.

Fix: 151024899
Test: manual, launch google map app -> enter PiP mode,
      swipe up to overview screen or launch activity from shortcut,
      make sure the PiP window is not covered by other apps.

Change-Id: I8028cd50d66f7d77e5d1ec6514e953c8be9935d6

quickstep/recents_ui_overrides/src/com/android/quickstep/util/AppWindowAnimationHelper.java

@@ -214,7 +214,6 @@ public class AppWindowAnimationHelper {
             float alpha;
             float cornerRadius = 0f;
             float scale = Math.max(mCurrentRect.width(), mTargetRect.width()) / crop.width();
-            int layer = RemoteAnimationProvider.getLayer(app, mBoostModeTargetLayers);
             if (app.mode == params.mTargetSet.targetMode) {
                 alpha = mTaskAlphaCallback.getAlpha(app, params.mTargetAlpha);
                 if (app.activityType != RemoteAnimationTargetCompat.ACTIVITY_TYPE_HOME) {
@@ -251,13 +250,11 @@ public class AppWindowAnimationHelper {
                 alpha = mBaseAlphaCallback.getAlpha(app, progress);
                 if (ENABLE_QUICKSTEP_LIVE_TILE.get() && params.mLauncherOnTop) {
                     crop = null;
-                    layer = Integer.MAX_VALUE;
                 }
             }
             builder.withAlpha(alpha)
                     .withMatrix(mTmpMatrix)
                     .withWindowCrop(crop)
-                    .withLayer(layer)
                     // Since radius is in Surface space, but we draw the rounded corners in screen
                     // space, we have to undo the scale
                     .withCornerRadius(cornerRadius / scale);

quickstep/src/com/android/launcher3/QuickstepAppTransitionManagerImpl.java

@@ -602,7 +602,6 @@ public abstract class QuickstepAppTransitionManagerImpl extends LauncherAppTrans
                                 .withWindowCrop(target.screenSpaceBounds)
                                 .withAlpha(1f);
                     }
-                    builder.withLayer(RemoteAnimationProvider.getLayer(target, MODE_OPENING));
                     params[i] = builder.build();
                 }
                 surfaceApplier.scheduleApply(params);
@@ -709,7 +708,6 @@ public abstract class QuickstepAppTransitionManagerImpl extends LauncherAppTrans
                     params[i] = new SurfaceParams.Builder(target.leash)
                             .withAlpha(1f)
                             .withWindowCrop(target.screenSpaceBounds)
-                            .withLayer(RemoteAnimationProvider.getLayer(target, MODE_OPENING))
                             .withCornerRadius(cornerRadius)
                             .build();
                 }
@@ -766,7 +764,6 @@ public abstract class QuickstepAppTransitionManagerImpl extends LauncherAppTrans
                     }
                     params[i] = builder
                             .withWindowCrop(target.screenSpaceBounds)
-                            .withLayer(RemoteAnimationProvider.getLayer(target, MODE_CLOSING))
                             .build();
                 }
                 surfaceApplier.scheduleApply(params);

quickstep/src/com/android/quickstep/util/RemoteAnimationProvider.java

@@ -62,15 +62,12 @@ public abstract class RemoteAnimationProvider {
     static void prepareTargetsForFirstFrame(RemoteAnimationTargetCompat[] targets,
             TransactionCompat t, int boostModeTargets) {
         for (RemoteAnimationTargetCompat target : targets) {
-            t.setLayer(target.leash, getLayer(target, boostModeTargets));
             t.show(target.leash);
         }
     }
 
     public static int getLayer(RemoteAnimationTargetCompat target, int boostModeTarget) {
-        return target.mode == boostModeTarget
-                ? Z_BOOST_BASE + target.prefixOrderIndex
-                : target.prefixOrderIndex;
+        return target.prefixOrderIndex;
     }
 
     /**