Add psutil build step to fix pyauto media issues. Upgrade psutil to 0.4.0.

chrome/chrome_tests.gypi

 # Copyright (c) 2011 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.
 {
   'variables' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 4025 matching lines @@
           'dependencies': [
             'chrome',
             'chrome_resources.gyp:chrome_resources',
             'chrome_resources.gyp:chrome_strings',
             'chrome_resources.gyp:theme_resources',
             'debugger',
             'syncapi_core',
             'test_support_common',
             '../skia/skia.gyp:skia',
             '../testing/gtest.gyp:gtest',
+            '../third_party/psutil/psutil.gyp:psutil_lib',
           ],
           'export_dependent_settings': [
             'test_support_common',
           ],
           'include_dirs': [
             '..',
           ],
           'cflags': [
              '-Wno-uninitialized',
              '-Wno-self-assign',  # to keep clang happy for generated code.
@@ skipping 267 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }