Add flag to enable proguard for debug build.

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 12 matching lines @@
 #    ],
 #  },
 #
 
 {
   'message': 'Creating dex file: <(output_path)',
   'variables': {
     'dex_input_paths': [],
     'dex_generated_input_dirs': [],
     'proguard_enabled%': 'false',
+    'debug_build_proguard_enabled%': 'false',

[jbudorick, 2015/10/19 19:52:15]

nit: Please TODO me to remove this once I've finished multidex.

[michaelbai, 2015/10/19 21:09:57]

Done.

     'proguard_enabled_input_path%': '',
     'dex_no_locals%': 0,
     'dex_additional_options': [],
   },
   'inputs': [
     '<(DEPTH)/build/android/gyp/util/build_utils.py',
     '<(DEPTH)/build/android/gyp/util/md5_check.py',
     '<(DEPTH)/build/android/gyp/dex.py',
     '>@(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)',
+    '--debug-build-proguard-enabled=>(debug_build_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)',
   ]
 }