Refactor emma_instr.py in preparation for porting EMMA GYP rules to GN

build/java.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 Java in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'my-package_java',
@@ skipping 312 matching lines @@
         '>@(java_sources)',
         '<@(extra_args)',
       ]
     },
     {
       'action_name': 'emma_instr_jar_<(_target_name)',
       'message': 'Instrumenting <(_target_name) jar',
       'variables': {
         'input_path': '<(jar_path)',
         'output_path': '<(jar_final_path)',
+        'coverage_file': '<(jar_dir)/<(_target_name).em',
+        'sources_list_file': '<(jar_dir)/<(_target_name)_sources.txt',
         'stamp_path': '<(emma_instr_stamp)',
       },
       'outputs': [
         '<(jar_final_path)',
       ],
       'inputs': [
         '<(jar_path)',
       ],
       'includes': [ 'android/emma_instr_action.gypi' ],
     },
@@ skipping 43 matching lines @@
             'dex_no_locals': 1,
           }],
         ],
         'dex_input_paths': [ '<(jar_final_path)' ],
         'output_path': '<(dex_path)',
       },
       'includes': [ 'android/dex_action.gypi' ],
     },
   ],
 }