diff --git a/android/shared_properties.go b/android/shared_properties.go
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+++ b/android/shared_properties.go
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+// Copyright 2024 Google Inc. All rights reserved.
+//
+// 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 android
+
+// For storing user-supplied properties about source code on a module to be queried later.
+type SourceProperties struct {
+	// Indicates that the module and its source code are only used in tests, not
+	// production code. Used by coverage reports and potentially other tools.
+	Test_only *bool
+	// Used internally to write if this is a top level test target.
+	// i.e. something that can be run directly or through tradefed as a test.
+	// `java_library` would be false, `java_test` would be true.
+	Top_level_test_target bool `blueprint:"mutated"`
+}