[Android] Make dex exclude paths relative to output dir.

build/android/dex_action.gypi

 # Copyright 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.
 
 # This file is meant to be included into an action to provide a rule that dexes
 # compiled java files. If proguard_enabled == "true" and CONFIGURATION_NAME ==
 # "Release", then it will dex the proguard_enabled_input_path instead of the
 # normal dex_input_paths/dex_generated_input_paths.
 #
 # To use this, create a gyp target with the following form:
@@ skipping 30 matching lines @@
     '>@(dex_input_paths)',
   ],
   'outputs': [
     '<(output_path)',
     '<(output_path).inputs',
   ],
   'action': [
     'python', '<(DEPTH)/build/android/gyp/dex.py',
     '--dex-path=<(output_path)',
     '--android-sdk-tools=<(android_sdk_tools)',
+    '--output-directory=<(PRODUCT_DIR)',
     '--configuration-name=<(CONFIGURATION_NAME)',
     '--proguard-enabled=>(proguard_enabled)',
     '--proguard-enabled-input-path=<(proguard_enabled_input_path)',
     '--no-locals=>(dex_no_locals)',
     '>@(dex_additional_options)',
     '>@(dex_input_paths)',
     '>@(dex_generated_input_dirs)',
   ]
 }