[Android] Do not fail if adb push returns no output.

build/android/pylib/android_commands.py

 # 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.
 
 """Provides an interface to communicate with the device via the adb command.
 
 Assumes adb binary is currently on system path.
 """
 
 import collections
@@ skipping 160 matching lines @@
   return files
 
 
 def _ComputeFileListHash(md5sum_output):
   """Returns a list of MD5 strings from the provided md5sum output."""
   return [line.split('  ')[0] for line in md5sum_output]
 
 
 def _HasAdbPushSucceeded(command_output):
   """Returns whether adb push has succeeded from the provided output."""
+  # TODO(frankf): We should look at the return code instead of the command
+  # output for many of the commands in this file.
   if not command_output:
-    return False
+    return True
   # Success looks like this: "3035 KB/s (12512056 bytes in 4.025s)"
   # Errors look like this: "failed to copy  ... "
   if not re.search('^[0-9]', command_output.splitlines()[-1]):
     logging.critical('PUSH FAILED: ' + command_output)
     return False
   return True
 
 
 def GetLogTimestamp(log_line, year):
   """Returns the timestamp of the given |log_line| in the given year."""
@@ skipping 1172 matching lines @@
   """
   def __init__(self, output):
     self._output = output
 
   def write(self, data):
     data = data.replace('\r\r\n', '\n')
     self._output.write(data)
 
   def flush(self):
     self._output.flush()