[Android] Fix checksum handling when md5sum generates unexpected output.

build/android/pylib/utils/md5sum.py

Index: build/android/pylib/utils/md5sum.py
diff --git a/build/android/pylib/utils/md5sum.py b/build/android/pylib/utils/md5sum.py
index da3cd15c785b0da5a2382816078d6817f63fc7aa..9dad097312f4570fd2a854f5bd1cdf1113a9d766 100644
--- a/build/android/pylib/utils/md5sum.py
+++ b/build/android/pylib/utils/md5sum.py
@@ -5,6 +5,7 @@
 import collections
 import logging
 import os
+import re
 import tempfile
 import types
 
@@ -21,6 +22,8 @@ MD5SUM_DEVICE_SCRIPT_FORMAT = (
     'test -f {path} -o -d {path} '
     '&& LD_LIBRARY_PATH={md5sum_lib} {device_pie_wrapper} {md5sum_bin} {path}')
 
+_STARTS_WITH_CHECKSUM_RE = re.compile(r'^\s*[0-9a-fA-f]{32}\s+')
+
 
 def CalculateHostMd5Sums(paths):
   """Calculates the MD5 sum value for all items in |paths|.
@@ -72,5 +75,7 @@ def CalculateDeviceMd5Sums(paths, device):
       device.adb.Push(md5sum_script_file.name, md5sum_device_script_file.name)
       out = device.RunShellCommand(['sh', md5sum_device_script_file.name])
 
-  return [HashAndPath(*l.split(None, 1)) for l in out if l]
+  return [HashAndPath(*l.split(None, 1))
+          for l in out
+          if l and _STARTS_WITH_CHECKSUM_RE.match(l)]