Add flag to enable proguard for debug build.

build/java_apk.gypi

 # Copyright (c) 2012 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 a target to provide a rule
 # to build Android APKs in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my_package_apk',
@@ skipping 75 matching lines @@
     'library_dexed_jars_paths': [],
     'main_dex_list_path': '<(intermediate_dir)/main_dex_list.txt',
     'main_dex_list_paths': ['<(main_dex_list_path)'],
     'additional_src_dirs': [],
     'generated_src_dirs': [],
     'app_manifest_version_name%': '<(android_app_version_name)',
     'app_manifest_version_code%': '<(android_app_version_code)',
     # aapt generates this proguard.txt.
     'generated_proguard_file': '<(intermediate_dir)/proguard.txt',
     'proguard_enabled%': 'false',
+    'debug_build_proguard_enabled%': 'false',

[jbudorick, 2015/10/19 13:24:13]

I really don't like doing this separately but can understand why it's probably a
better idea to do so.

     'proguard_flags_paths': ['<(generated_proguard_file)'],
     'jar_name': 'chromium_apk_<(_target_name).jar',
     'resource_dir%':'<(DEPTH)/build/android/ant/empty/res',
     'R_package%':'',
     'include_all_resources%': 0,
     'additional_R_text_files': [],
     'dependencies_locale_zip_alternative_paths%': [],
     'dependencies_locale_zip_paths': [],
     'dependencies_res_zip_paths': [],
     'additional_res_packages': [],
@@ skipping 139 matching lines @@
   # Pass the jar path to the apk's "fake" jar target.  This would be better as
   # direct_dependent_settings, but a variable set by a direct_dependent_settings
   # cannot be lifted in a dependent to all_dependent_settings.
   'all_dependent_settings': {
     'conditions': [
       ['proguard_enabled == "true"', {
         'variables': {
           'proguard_enabled': 'true',
         }
       }],
+      ['debug_build_proguard_enabled == "true"', {
+        'variables': {
+          'debug_build_proguard_enabled': 'true',
+        }
+      }],
     ],
     'variables': {
       'apk_output_jar_path': '<(jar_path)',
       'tested_apk_obfuscated_jar_path': '<(obfuscated_jar_path)',
       'tested_apk_dex_path': '<(dex_path)',
       'tested_apk_is_multidex': '<(enable_multidex)',
     },
   },
   'conditions': [
     ['resource_dir!=""', {
@@ skipping 728 matching lines @@
             ],
             'additional_obfuscate_input_paths': [
               '>(tested_apk_obfuscated_jar_path).info',
             ],
           }],
           ['proguard_enabled == "true"', {
             'additional_obfuscate_options': [
               '--proguard-enabled',
             ],
           }],
+          ['debug_build_proguard_enabled == "true"', {
+            'additional_obfuscate_options': [
+              '--debug-build-proguard-enabled',
+            ],
+          }],
         ],
         'obfuscate_input_jars_paths': [
           '>@(input_jars_paths)',
           '<(jar_path)',
         ],
       },
       'conditions': [
         ['is_test_apk == 1', {
           'outputs': [
             '<(test_jar_path)',
@@ skipping 89 matching lines @@
         ['is_test_apk == 1 and tested_apk_dex_path != "/"', {
           'variables': {
             'dex_additional_options': [
               '--excluded-paths', '@FileArg(>(tested_apk_dex_path).inputs)'
             ],
           },
           'inputs': [
             '>(tested_apk_dex_path).inputs',
           ],
         }],
-        ['proguard_enabled == "true"', {
+        ['proguard_enabled == "true" or debug_build_proguard_enabled == "true"', {
           'inputs': [ '<(obfuscate_stamp)' ]
         }, {
           'inputs': [ '<(emma_instr_stamp)' ]
         }],
       ],
       'includes': [ 'android/dex_action.gypi' ],
     },
     {
       'variables': {
         'local_dependencies_res_zip_paths': ['>@(dependencies_res_zip_paths)'],
@@ skipping 27 matching lines @@
             'native_libs_dir': '<(apk_package_native_libs_dir)',
           }, {
             'native_libs_dir': '<(DEPTH)/build/android/ant/empty/res',
           }],
         ],
       },
       'includes': ['android/apkbuilder_action.gypi'],
     },
   ],
 }