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diff --git a/java/com/android/dialer/inject/IncludeInDialerRoot.java b/java/com/android/dialer/inject/IncludeInDialerRoot.java
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+++ b/java/com/android/dialer/inject/IncludeInDialerRoot.java
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+/*
+ * Copyright (C) 2018 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.dialer.inject;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Target;
+
+/**
+ * Annotates a type that should be included in Dialer Root Component. Typically, annotated types are
+ * HasComponent interfaces.
+ *
+ * <p>An example:
+ *
+ * <pre>
+ * <code>
+ * {@literal @}dagger.Subcomponent
+ * public abstract class SimulatorComponent {
+ *   public static SimulatorComponent get(Context context) {
+ *      return ((HasComponent)((HasRootComponent) context.getApplicationContext()).component())
+ *         .simulatorComponent();
+ *   }
+ *   {@literal @}IncludeInDialerRoot
+ *   public interface HasComponent {
+ *      SimulatorComponent simulatorComponent();
+ *  }
+ * }
+ * </code>
+ * </pre>
+ */
+@Target(ElementType.TYPE)
+public @interface IncludeInDialerRoot {
+  Class<?>[] modules() default {};
+}