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diff --git a/core/java/android/compat/IPlatformCompat.aidl b/core/java/android/compat/IPlatformCompat.aidl
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+++ b/core/java/android/compat/IPlatformCompat.aidl
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+/*
+ * Copyright (C) 2019 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.compat;
+
+import android.content.pm.ApplicationInfo;
+
+/**
+ * Platform private API for talking with the PlatformCompat service.
+ *
+ * <p> Should be used for gating and logging from non-app processes.
+ * For app processes please use android.compat.Compatibility API.
+ *
+ * {@hide}
+ */
+interface IPlatformCompat
+{
+
+    /**
+     * Reports that a compatibility change is affecting an app process now.
+     *
+     * <p>Note: for changes that are gated using {@link #isChangeEnabled(long, ApplicationInfo)},
+     * you do not need to call this API directly. The change will be reported for you in the case
+     * that {@link #isChangeEnabled(long, ApplicationInfo)} returns {@code true}.
+     *
+     * @param changeId The ID of the compatibility change taking effect.
+     * @param appInfo Representing the affected app.
+     */
+    void reportChange(long changeId, in ApplicationInfo appInfo);
+
+    /**
+     * Query if a given compatibility change is enabled for an app process. This method should
+     * be called when implementing functionality on behalf of the affected app.
+     *
+     * <p>If this method returns {@code true}, the calling code should implement the compatibility
+     * change, resulting in differing behaviour compared to earlier releases. If this method returns
+     * {@code false}, the calling code should behave as it did in earlier releases.
+     *
+     * <p>When this method returns {@code true}, it will also report the change as
+     * {@link #reportChange(long, ApplicationInfo)} would, so there is no need to call that method
+     * directly.
+     *
+     * @param changeId The ID of the compatibility change in question.
+     * @param appInfo Representing the app in question.
+     * @return {@code true} if the change is enabled for the current app.
+     */
+    boolean isChangeEnabled(long changeId, in ApplicationInfo appInfo);
+}
+\ No newline at end of file