Reconcile Expandable.kt on master/tm-qpr-dev-plus-aosp and tm-qpr-dev

This CL reconciles the content of Expandable.kt in the
tm-qpr-dev-plus-aosp branch and tm-qpr-dev. This CL being on
tm-qpr-dev-plus-aosp, this will also be merged in master.

Currently the files are different because the androidx.savedstate
library was updated in tm-qpr-dev-plus-aosp in http://ag/19946745, and
removed the ViewTreeSavedStateRegistryOwner APIs. Ideally, instead of
this CL, we would update the androidx.savedstate library in tm-qpr-dev
but I'm getting build errors in http://ag/20708667 that might take a
while to fix. Until I manage to get that CL in, I suggest we work around
it in this CL by re-introducing the ViewTreeSavedStateRegistryOwner API
used by tm-qpr-dev, which forwards calls to the API that replaced it.
That way we can unblock the few CLs like http://ag/20256703 and
http://ag/20711619 which currently have conflicts with master and
tm-qpr-dev-plus-aosp.

Bug: 262222023
Test: Builds
Change-Id: I97660c5a9a2758c5e19d037e635c21456b6085c3

packages/SystemUI/compose/core/src/com/android/systemui/compose/animation/Expandable.kt

@@ -53,8 +53,6 @@ import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.unit.Density
 import androidx.lifecycle.ViewTreeLifecycleOwner
 import androidx.lifecycle.ViewTreeViewModelStoreOwner
-import androidx.savedstate.findViewTreeSavedStateRegistryOwner
-import androidx.savedstate.setViewTreeSavedStateRegistryOwner
 import com.android.systemui.animation.LaunchAnimator
 import kotlin.math.min
 
@@ -298,8 +296,9 @@ private fun AnimatedContentInOverlay(
                 overlayViewGroup,
                 ViewTreeViewModelStoreOwner.get(composeViewRoot),
             )
-            overlayViewGroup.setViewTreeSavedStateRegistryOwner(
-                composeViewRoot.findViewTreeSavedStateRegistryOwner()
+            ViewTreeSavedStateRegistryOwner.set(
+                overlayViewGroup,
+                ViewTreeSavedStateRegistryOwner.get(composeViewRoot),
             )
 
             composeView.setParentCompositionContext(compositionContext)

packages/SystemUI/compose/core/src/com/android/systemui/compose/animation/ViewTreeSavedStateRegistryOwner.kt

@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.systemui.compose.animation
+
+import android.view.View
+import androidx.savedstate.SavedStateRegistryOwner
+import androidx.savedstate.findViewTreeSavedStateRegistryOwner
+import androidx.savedstate.setViewTreeSavedStateRegistryOwner
+
+// TODO(b/262222023): Remove this workaround and import the new savedstate libraries in tm-qpr-dev
+// instead.
+object ViewTreeSavedStateRegistryOwner {
+    fun set(view: View, owner: SavedStateRegistryOwner?) {
+        view.setViewTreeSavedStateRegistryOwner(owner)
+    }
+
+    fun get(view: View): SavedStateRegistryOwner? {
+        return view.findViewTreeSavedStateRegistryOwner()
+    }
+}