Support multiple proguard flags from java_apk.gypi. Proguard supports multiple proguard configurati…

build/android/ant/apk-obfuscate.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <!--
     Copyright (C) 2005-2008 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
 
@@ skipping 111 matching lines @@
           </firstmatchmapper>
         </pathconvert>
 
         <!-- Turn the path property ${proguard.config} from an A:B:C property
              into a series of includes: -include A -include B -include C
              suitable for processing by the ProGuard task. Note - this does
              not include the leading '-include "' or the closing '"'; those
              are added under the <proguard> call below.
         -->
         <path id="proguard.configpath">
-          <pathelement path="${proguard.config}"/>
+          <filelist files="${proguard.config}"/>
         </path>
         <pathconvert pathsep='" -include "' property="proguard.configcmd"
           refid="proguard.configpath"/>
 
         <mkdir   dir="${obfuscate.absolute.dir}"/>
         <delete file="${preobfuscate.jar.file}"/>
         <delete file="${obfuscated.jar.abs.file}"/>
         <jar basedir="${out.classes.absolute.dir}"
           destfile="${preobfuscate.jar.file}"/>
         <proguard>
           -include      "${proguard.configcmd}"
           -include      "${out.absolute.dir}/proguard.txt"
           -injars       ${project.all.classes.value}
           -outjars      "${obfuscated.jar.abs.file}"
           -libraryjars  ${project.target.classpath.value}
           -dump         "${obfuscate.absolute.dir}/dump.txt"
           -printseeds   "${obfuscate.absolute.dir}/seeds.txt"
           -printusage   "${obfuscate.absolute.dir}/usage.txt"
           -printmapping "${obfuscate.absolute.dir}/mapping.txt"
         </proguard>
       </then>
     </if>
     <touch file="${STAMP}" />
   </target>
 </project>