Refactor print-layout-test-times and add unit tests.

Tools/Scripts/webkitpy/common/system/systemhost_mock.py

Index: Tools/Scripts/webkitpy/common/system/systemhost_mock.py
diff --git a/Tools/Scripts/webkitpy/common/system/systemhost_mock.py b/Tools/Scripts/webkitpy/common/system/systemhost_mock.py
index 4667b08b9ab8df24ab6151a71dc533e42567fe9e..b39b4ea0b7622bcd5c0c49f9135b4cbce42b5f3a 100644
--- a/Tools/Scripts/webkitpy/common/system/systemhost_mock.py
+++ b/Tools/Scripts/webkitpy/common/system/systemhost_mock.py
@@ -1,30 +1,31 @@
-    # Copyright (c) 2011 Google Inc. All rights reserved.
-    #
-    # Redistribution and use in source and binary forms, with or without
-    # modification, are permitted provided that the following conditions are
-    # met:
-    #
-    #     * Redistributions of source code must retain the above copyright
-    # notice, this list of conditions and the following disclaimer.
-    #     * Redistributions in binary form must reproduce the above
-    # copyright notice, this list of conditions and the following disclaimer
-    # in the documentation and/or other materials provided with the
-    # distribution.
-    #     * Neither the name of Google Inc. nor the names of its
-    # contributors may be used to endorse or promote products derived from
-    # this software without specific prior written permission.
-    #
-    # THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-    # "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-    # LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-    # A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-    # OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-    # SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-    # LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-    # DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-    # THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-    # (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-    # OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+# Copyright (c) 2011 Google Inc. All rights reserved.
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions are
+# met:
+#
+#     * Redistributions of source code must retain the above copyright
+# notice, this list of conditions and the following disclaimer.
+#     * Redistributions in binary form must reproduce the above
+# copyright notice, this list of conditions and the following disclaimer
+# in the documentation and/or other materials provided with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+from StringIO import StringIO
 
 from webkitpy.common.system.environment import Environment
 from webkitpy.common.system.executive_mock import MockExecutive
@@ -48,5 +49,17 @@ class MockSystemHost(object):
         # FIXME: Should this take pointers to the filesystem and the executive?
         self.workspace = MockWorkspace()
 
+        self.stdout = StringIO()
+        self.stderr = StringIO()
+
     def copy_current_environment(self):
         return Environment({"MOCK_ENVIRON_COPY": '1'})
+
+    def print_(self, *args, **kwargs):
+        sep = kwargs.get('sep', ' ')
+        end = kwargs.get('end', '\n')
+        file = kwargs.get('file', None)
+        stderr = kwargs.get('stderr', False)
+
+        file = file or (self.stderr if stderr else self.stdout)
+        file.write(sep.join([str(arg) for arg in args]) + end)