Fix javac --incremental by using jmake for dependency analysis

build/android/gyp/util/md5_check.py

 # 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.
 
 import difflib
 import hashlib
 import itertools
 import json
 import os
 import sys
 import zipfile
 
 
 # When set and a difference is detected, a diff of what changed is printed.
-_PRINT_MD5_DIFFS = int(os.environ.get('PRINT_MD5_DIFFS', 0))
+PRINT_EXPLANATIONS = int(os.environ.get('PRINT_BUILD_EXPLANATIONS', 0))
 
 # An escape hatch that causes all targets to be rebuilt.
 _FORCE_REBUILD = int(os.environ.get('FORCE_REBUILD', 0))
 
 
 def CallAndRecordIfStale(
     function, record_path=None, input_paths=None, input_strings=None,
     output_paths=None, force=False, pass_changes=False):
   """Calls function if outputs are stale.
 
@@ skipping 44 matching lines @@
     with open(record_path, 'r') as jsonfile:
       try:
         old_metadata = _Metadata.FromFile(jsonfile)
       except:  # pylint: disable=bare-except
         pass  # Not yet using new file format.
 
   changes = Changes(old_metadata, new_metadata, force, missing_outputs)
   if not changes.HasChanges():
     return
 
-  if _PRINT_MD5_DIFFS:
+  if PRINT_EXPLANATIONS:
     print '=' * 80
     print 'Target is stale: %s' % record_path
     print changes.DescribeDifference()
     print '=' * 80
 
   args = (changes,) if pass_changes else ()
   function(*args)
 
   with open(record_path, 'w') as f:
     new_metadata.ToFile(f)
@@ skipping 298 matching lines @@
 
 def _ExtractZipEntries(path):
   """Returns a list of (path, CRC32) of all files within |path|."""
   entries = []
   with zipfile.ZipFile(path) as zip_file:
     for zip_info in zip_file.infolist():
       # Skip directories and empty files.
       if zip_info.CRC:
         entries.append((zip_info.filename, zip_info.CRC))
   return entries