diff --git a/proto/src/task_snapshot.proto b/proto/src/task_snapshot.proto
deleted file mode 100644
index 1cbc17e..0000000
--- a/proto/src/task_snapshot.proto
+++ /dev/null
@@ -1,48 +0,0 @@
-/*
- * Copyright (C) 2017 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.
- */
-
- syntax = "proto3";
-
- package com.android.server.wm;
-
- option java_package = "com.android.server.wm";
- option java_outer_classname = "WindowManagerProtos";
-
- message TaskSnapshotProto {
-     int32 orientation = 1;
-     int32 inset_left = 2;
-     int32 inset_top = 3;
-     int32 inset_right = 4;
-     int32 inset_bottom = 5;
-     bool is_real_snapshot = 6;
-     int32 windowing_mode = 7;
-     int32 system_ui_visibility = 8 [deprecated=true];
-     bool is_translucent = 9;
-     string top_activity_component = 10;
-     // deprecated because original width and height are stored now instead of the scale.
-     float legacy_scale = 11 [deprecated=true];
-     int64 id = 12;
-     int32 rotation = 13;
-     // The task width when the snapshot was taken
-     int32 task_width = 14;
-     // The task height when the snapshot was taken
-     int32 task_height = 15;
-     int32 appearance = 16;
-     int32 letterbox_inset_left = 17;
-     int32 letterbox_inset_top = 18;
-     int32 letterbox_inset_right = 19;
-     int32 letterbox_inset_bottom = 20;
- }
diff --git a/proto/src/windowmanager.proto b/proto/src/windowmanager.proto
new file mode 100644
index 0000000..f26404c6
--- /dev/null
+++ b/proto/src/windowmanager.proto
@@ -0,0 +1,71 @@
+/*
+ * 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.
+ */
+
+syntax = "proto3";
+
+package com.android.server.wm;
+
+option java_package = "com.android.server.wm";
+option java_outer_classname = "WindowManagerProtos";
+
+message TaskSnapshotProto {
+  int32 orientation = 1;
+  int32 inset_left = 2;
+  int32 inset_top = 3;
+  int32 inset_right = 4;
+  int32 inset_bottom = 5;
+  bool is_real_snapshot = 6;
+  int32 windowing_mode = 7;
+  int32 system_ui_visibility = 8 [deprecated=true];
+  bool is_translucent = 9;
+  string top_activity_component = 10;
+  // deprecated because original width and height are stored now instead of the scale.
+  float legacy_scale = 11 [deprecated=true];
+  int64 id = 12;
+  int32 rotation = 13;
+  // The task width when the snapshot was taken
+  int32 task_width = 14;
+  // The task height when the snapshot was taken
+  int32 task_height = 15;
+  int32 appearance = 16;
+  int32 letterbox_inset_left = 17;
+  int32 letterbox_inset_top = 18;
+  int32 letterbox_inset_right = 19;
+  int32 letterbox_inset_bottom = 20;
+}
+
+// Persistent letterboxing configurations
+message LetterboxProto {
+
+  // Possible values for the letterbox horizontal reachability
+  enum LetterboxHorizontalReachability {
+    LETTERBOX_HORIZONTAL_REACHABILITY_POSITION_LEFT = 0;
+    LETTERBOX_HORIZONTAL_REACHABILITY_POSITION_CENTER = 1;
+    LETTERBOX_HORIZONTAL_REACHABILITY_POSITION_RIGHT = 2;
+  }
+
+  // Possible values for the letterbox vertical reachability
+  enum LetterboxVerticalReachability {
+    LETTERBOX_VERTICAL_REACHABILITY_POSITION_TOP = 0;
+    LETTERBOX_VERTICAL_REACHABILITY_POSITION_CENTER = 1;
+    LETTERBOX_VERTICAL_REACHABILITY_POSITION_BOTTOM = 2;
+  }
+
+  // Represents the current horizontal position for the letterboxed activity
+  LetterboxHorizontalReachability letterbox_position_for_horizontal_reachability = 1;
+  // Represents the current vertical position for the letterboxed activity
+  LetterboxVerticalReachability letterbox_position_for_vertical_reachability = 2;
+}
\ No newline at end of file