Fix the conflict of input and output manifest files

testing/android/native_test_apk.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!--
 Copyright (c) 2012 The Chromium Authors. All rights reserved.
 Use of this source code is governed by a BSD-style license that can be
 found in the LICENSE file.
 -->
 
 <project name="replaceme" default="debug" basedir=".">
 
   <description>
@@ skipping 48 matching lines @@
       <fileset dir="${external.jars.dir}" includes="*.jar"/>
   </path>
   <condition property="java.compilerargs"
              value="-classpath ${toString:out.dex.jar.input.ref}">
     <not>
       <equals arg1="${external.jars.dir}" arg2=""/>
     </not>
   </condition>
   <property name="native.libs.absolute.dir" location="${out.dir}/libs" />
 
+  <!-- Copy the below manifest file to a new directory because the project
+       base directory and output directory are the same and manifest merge
+       task takes the same file as source and target when doing copying.
+       Otherwise it'll generate an empty manifest file. -->
+  <copy file="AndroidManifest.xml" todir="${out.dir}/manifest"/>
+  <property name="manifest.abs.file" location="${out.dir}/manifest/AndroidManifest.xml"/>
+
   <target name="-post-compile">
     <!-- copy gdbserver to main libs directory if building debug. -->
     <if>
       <condition>
         <equals arg1="${build.target}" arg2="debug" />
       </condition>
       <then>
         <echo message="Copying gdbserver to the apk to enable native debugging"/>
         <copy todir="${out.dir}/libs/${target.abi}">
           <path refid="native.libs.gdbserver"/>
         </copy>
       </then>
     </if>
   </target>
 
   <import file="${sdk.dir}/tools/ant/build.xml" />
 
 </project>