Place the mojo_android_application output at the root output directory.

mojo/public/mojo_application.gni

 # Copyright 2014 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.
 
 import("mojo.gni")
 import("mojo_sdk.gni")
 
 # Generate a binary mojo application.The parameters of this template are those
 # of a shared library.
 template("mojo_native_application") {
@@ skipping 152 matching lines @@
 
       rebase_inputs = rebase_path(inputs, root_build_dir)
       rebase_output = rebase_path(output, root_build_dir)
       args = [
         "--inputs=$rebase_inputs",
         "--output=$rebase_output",
       ]
     }
 
     if (defined(invoker.output_name)) {
-      mojo_output = "$target_out_dir/" + invoker.output_name + ".mojo"
+      mojo_output = "$root_out_dir/" + invoker.output_name + ".mojo"
     } else {
-      mojo_output = "$target_out_dir/" + target_name + ".mojo"
+      mojo_output = "$root_out_dir/" + target_name + ".mojo"
     }
 
     action(target_name) {
       script = rebase_path("mojo/public/tools/prepend.py", ".", mojo_root)
 
       input = zip_action_output
       inputs = [ input ]
 
       output = mojo_output
       outputs = [ output ]
 
       rebase_input = rebase_path(input, root_build_dir)
       rebase_output = rebase_path(output, root_build_dir)
       args = [
         "--input=$rebase_input",
         "--output=$rebase_output",
         "--line=#!mojo:android_handler",
       ]
     }
   }
 }