[Tether07] Migrate Tethering into module

Now tethering would be run in dedicated service.
TetheringManager is the interface used to communicate with
TetheringService. The new call flow would be: ConnectivityManager
-> ConnectivityService -> TetheringManager -> TetheringService.
Note: the return value of #tether(), #untether() and #setUsbTethering()
APIs would always be no error. Client can use #getLastTetherError()
or #getTetheredIfaces or listen tether state change to check
status of corresponding interface.

Bug: 136040414
Bug: 144742179
Test: -build, flash, boot
      -atest TetheringTests
      -atest FrameworksNetTests

Change-Id: I7e78c0e0a3e70f940a749ba2a39ece7c7ec5b9b3
Merged-In: I7e78c0e0a3e70f940a749ba2a39ece7c7ec5b9b3
diff --git a/Tethering/AndroidManifest_InProcess.xml b/Tethering/AndroidManifest_InProcess.xml
new file mode 100644
index 0000000..28d405c
--- /dev/null
+++ b/Tethering/AndroidManifest_InProcess.xml
@@ -0,0 +1,35 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+/*
+ * 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.
+ */
+-->
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+          package="com.android.tethering.inprocess"
+          android:sharedUserId="android.uid.system"
+          android:process="system">
+    <uses-sdk android:minSdkVersion="29" android:targetSdkVersion="29" />
+    <application>
+        <!-- TODO: Using MAINLINE_NETWORK_STACK instead of NETWORK_STACK when tethering run in the
+                   same process with networkstack -->
+        <service android:name="com.android.server.connectivity.tethering.TetheringService"
+                 android:process="system"
+                 android:permission="android.permission.NETWORK_STACK">
+            <intent-filter>
+                <action android:name="android.net.ITetheringConnector.InProcess"/>
+            </intent-filter>
+        </service>
+    </application>
+</manifest>