Update autotest tests to use make -j where possible.

client/site_tests/graphics_SanAngeles/graphics_SanAngeles.py

 # Copyright (c) 2009 The Chromium OS 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 logging, os, re
 
 from autotest_lib.client.bin import site_login, site_ui_test
 from autotest_lib.client.common_lib import error, site_ui, utils
 
 class graphics_SanAngeles(site_ui_test.UITest):
     version = 1
     preserve_srcdir = True
 
 
     def setup(self):
         os.chdir(self.srcdir)
-        utils.system('make clean')
-        utils.system('make all')
+        utils.make('clean')
+        utils.make('all')
 
 
     def run_once(self):
         cmd_gl = os.path.join(self.srcdir, 'SanOGL')
         cmd_gles = os.path.join(self.srcdir, 'SanOGLES')
         cmd_gles_s = os.path.join(self.srcdir, 'SanOGLES_S')
         if os.path.isfile(cmd_gl):
             cmd = cmd_gl
         elif os.path.isfile(cmd_gles):
             cmd = cmd_gles
         elif os.path.isfile(cmd_gles_s):
             cmd = cmd_gles_s
         else:
             raise error.TestFail('Fail to locate SanAngles Observation exe.'
                                  'Test setup error.') 
 
         cmd = site_ui.xcommand(cmd)
         result = utils.run(cmd, ignore_status = True)
 
         report = re.findall(r"frame_rate = ([0-9.]+)", result.stdout)
         if len(result.stderr) > 0 or not report:
             raise error.TestFail('Fail to complete San Angeles Observation' +
                                  result.stderr)
         frame_rate = float(report[0])
         logging.info('frame_rate = %.1f' % frame_rate)
         self.write_perf_keyval(
             {'frames_per_sec_rate_san_angeles': frame_rate})