diff --git a/android/os/AppZygote.java b/android/os/AppZygote.java
new file mode 100644
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--- /dev/null
+++ b/android/os/AppZygote.java
@@ -0,0 +1,130 @@
+/*
+ * 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 android.os;
+
+import android.content.pm.ApplicationInfo;
+import android.util.Log;
+
+import com.android.internal.annotations.GuardedBy;
+
+/**
+ * AppZygote is responsible for interfacing with an application-specific zygote.
+ *
+ * Application zygotes can pre-load app-specific code and data, and this interface can
+ * be used to spawn isolated services from such an application zygote.
+ *
+ * Note that we'll have only one instance of this per application / uid combination.
+ *
+ * @hide
+ */
+public class AppZygote {
+    private static final String LOG_TAG = "AppZygote";
+
+    // UID of the Zygote itself
+    private final int mZygoteUid;
+
+    // First UID/GID of the range the AppZygote can setuid()/setgid() to
+    private final int mZygoteUidGidMin;
+
+    // Last UID/GID of the range the AppZygote can setuid()/setgid() to
+    private final int mZygoteUidGidMax;
+
+    private final Object mLock = new Object();
+
+    /**
+     * Instance that maintains the socket connection to the zygote. This is {@code null} if the
+     * zygote is not running or is not connected.
+     */
+    @GuardedBy("mLock")
+    private ChildZygoteProcess mZygote;
+
+    private final ApplicationInfo mAppInfo;
+
+    public AppZygote(ApplicationInfo appInfo, int zygoteUid, int uidGidMin, int uidGidMax) {
+        mAppInfo = appInfo;
+        mZygoteUid = zygoteUid;
+        mZygoteUidGidMin = uidGidMin;
+        mZygoteUidGidMax = uidGidMax;
+    }
+
+    /**
+     * Returns the zygote process associated with this app zygote.
+     * Creates the process if it's not already running.
+     */
+    public ChildZygoteProcess getProcess() {
+        synchronized (mLock) {
+            if (mZygote != null) return mZygote;
+
+            connectToZygoteIfNeededLocked();
+            return mZygote;
+        }
+    }
+
+    /**
+     * Stops the Zygote and kills the zygote process.
+     */
+    public void stopZygote() {
+        synchronized (mLock) {
+            stopZygoteLocked();
+        }
+    }
+
+    public ApplicationInfo getAppInfo() {
+        return mAppInfo;
+    }
+
+    @GuardedBy("mLock")
+    private void stopZygoteLocked() {
+        if (mZygote != null) {
+            // Close the connection and kill the zygote process. This will not cause
+            // child processes to be killed by itself.
+            mZygote.close();
+            Process.killProcess(mZygote.getPid());
+            mZygote = null;
+        }
+    }
+
+    @GuardedBy("mLock")
+    private void connectToZygoteIfNeededLocked() {
+        String abi = mAppInfo.primaryCpuAbi != null ? mAppInfo.primaryCpuAbi :
+                Build.SUPPORTED_ABIS[0];
+        try {
+            mZygote = Process.ZYGOTE_PROCESS.startChildZygote(
+                    "com.android.internal.os.AppZygoteInit",
+                    mAppInfo.processName + "_zygote",
+                    mZygoteUid,
+                    mZygoteUid,
+                    null,  // gids
+                    0,  // runtimeFlags
+                    "app_zygote",  // seInfo
+                    abi,  // abi
+                    abi, // acceptedAbiList
+                    null, // instructionSet
+                    mZygoteUidGidMin,
+                    mZygoteUidGidMax);
+
+            ZygoteProcess.waitForConnectionToZygote(mZygote.getPrimarySocketAddress());
+            // preload application code in the zygote
+            Log.i(LOG_TAG, "Starting application preload.");
+            mZygote.preloadApp(mAppInfo, abi);
+            Log.i(LOG_TAG, "Application preload done.");
+        } catch (Exception e) {
+            Log.e(LOG_TAG, "Error connecting to app zygote", e);
+            stopZygoteLocked();
+        }
+    }
+}