Add windowing mode to task snapshot.

Bug: 78155683
Test: atest FrameworksServicesTests:TaskSnapshotPersisterLoaderTest
Change-Id: I4e562d818416a30d6759baef37c74b6d9c514a00
diff --git a/proto/src/task_snapshot.proto b/proto/src/task_snapshot.proto
index 490a59e..27febef 100644
--- a/proto/src/task_snapshot.proto
+++ b/proto/src/task_snapshot.proto
@@ -28,4 +28,5 @@
      int32 inset_right = 4;
      int32 inset_bottom = 5;
      bool is_real_snapshot = 6;
+     int32 windowing_mode = 7;
  }
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