Add SDK 29 sources.

Test: N/A
Change-Id: Iedb7a31029e003928eb16f7e69ed147e72bb6235
diff --git a/android/annotation/SdkConstant.java b/android/annotation/SdkConstant.java
new file mode 100644
index 0000000..0a53186
--- /dev/null
+++ b/android/annotation/SdkConstant.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2008 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 android.annotation;
+
+import java.lang.annotation.Target;
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+
+/**
+ * Indicates a constant field value should be exported to be used in the SDK tools.
+ * @hide
+ */
+@Target({ ElementType.FIELD })
+@Retention(RetentionPolicy.SOURCE)
+public @interface SdkConstant {
+    public static enum SdkConstantType {
+        ACTIVITY_INTENT_ACTION, BROADCAST_INTENT_ACTION, SERVICE_ACTION, INTENT_CATEGORY, FEATURE;
+    }
+
+    SdkConstantType value();
+}