[Testing] Be more aggressive when killing android processes via ADB.

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 507 matching lines @@
     """Android version of killall, connected via adb.
 
     Args:
       process: name of the process to kill off
 
     Returns:
       the number of processes killed
     """
     pids = self.ExtractPid(process)
     if pids:
-      self.RunShellCommand('kill ' + ' '.join(pids))
+      self.RunShellCommand('kill -9 ' + ' '.join(pids))
     return len(pids)
 
   def KillAllBlocking(self, process, timeout_sec):
     """Blocking version of killall, connected via adb.
 
     This waits until no process matching the corresponding name appears in ps'
     output anymore.
 
     Args:
       process: name of the process to kill off
@@ skipping 750 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()