Make Mojo work on Android again

mojo/build/package_app.gypi

+# Copyright (c) 2013 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.
+
+{
+  'type': 'none',
+  'dependencies': [
+    '<(app_name)',
+  ],
+  'conditions': [
+    ['OS=="android"', {
+      'variables': {
+        'mojo_app_dir': '<(PRODUCT_DIR)/apps',
+        'source_binary': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)<(app_name)<(SHARED_LIB_SUFFIX)',
+        'target_binary': '<(mojo_app_dir)/<(SHARED_LIB_PREFIX)<(app_name)<(SHARED_LIB_SUFFIX)',
+      },
+      'actions': [{
+        'action_name': 'strip',
+        'inputs': [ '<(source_binary)', ],
+        'outputs': [ '<(target_binary)', ],
+        'action': [
+          '<(android_strip)',
+          '<@(_inputs)',
+          '--strip-unneeded',
+          '-o',
+          '<@(_outputs)',
+        ],
+      }],
+    }],
+  ],
+}