[tools] add --pretty switch to run_perf.py

tools/unittests/run_perf_test.py

 #!/usr/bin/env python
 # Copyright 2014 the V8 project authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 from collections import namedtuple
 import coverage
 import json
 from mock import DEFAULT
 from mock import MagicMock
@@ skipping 394 matching lines @@
 
   # Simple test that mocks out the android platform. Testing the platform would
   # require lots of complicated mocks for the android tools.
   def testAndroid(self):
     self._WriteTestInput(V8_JSON)
     # FIXME(machenbach): This is not test-local!
     platform = run_perf.AndroidPlatform
     platform.PreExecution = MagicMock(return_value=None)
     platform.PostExecution = MagicMock(return_value=None)
     platform.PreTests = MagicMock(return_value=None)
+    platform.PrintResult = MagicMock(return_value=None)
     platform.Run = MagicMock(
         return_value=("Richards: 1.234\nDeltaBlue: 10657567\n", None))
     run_perf.AndroidPlatform = MagicMock(return_value=platform)
     self.assertEquals(
         0, self._CallMain("--android-build-tools", "/some/dir",
                           "--arch", "arm"))
     self._VerifyResults("test", "score", [
       {"name": "Richards", "results": ["1.234"], "stddev": ""},
       {"name": "DeltaBlue", "results": ["10657567.0"], "stddev": ""},
     ])
@@ skipping 41 matching lines @@
     self._VerifyMock(path.join("out", "x64.release", "d7"),
                      "--flag", "--prof", "run.js")
 
   def testUnzip(self):
     def Gen():
       for i in [1, 2, 3]:
         yield i, i + 1
     l, r = run_perf.Unzip(Gen())
     self.assertEquals([1, 2, 3], list(l()))
     self.assertEquals([2, 3, 4], list(r()))