Rezip tool used to modify the APK.

build/android/rezip.gyp

Index: build/android/rezip.gyp
diff --git a/tools/android/file_poller/file_poller.gyp b/build/android/rezip.gyp
similarity index 55%
copy from tools/android/file_poller/file_poller.gyp
copy to build/android/rezip.gyp
index 097344d2d29937d49bae28f12b937aadab8db3f6..b06ac52cb24ccd927e5d08b0ff3eeb113e555d4d 100644
--- a/tools/android/file_poller/file_poller.gyp
+++ b/build/android/rezip.gyp
@@ -2,17 +2,22 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
+# Build the rezip build tool.
 {
   'targets': [
     {
-      'target_name': 'file_poller',
+      'target_name': 'rezip',
       'type': 'executable',
+      'toolsets': [ 'host' ],
       'dependencies': [
-        '../../../base/base.gyp:base',
+        '<(DEPTH)/third_party/zlib/zlib.gyp:minizip',
+      ],
+      'include_dirs': [
+        '<(DEPTH)',
       ],
       'sources': [
-        'file_poller.cc',
+        'rezip/rezip.cc',
       ],
-    },
+    }
   ],
 }