Add build link to rebaseline-o-matic CL descriptions.

third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline_unittest.py

 # Copyright 2016 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.
 
 import optparse
 
 from webkitpy.common.net.buildbot import Build
 from webkitpy.common.net.layout_test_results import LayoutTestResults
 from webkitpy.common.system.executive_mock import MockExecutive
 from webkitpy.layout_tests.builder_list import BuilderList
@@ skipping 89 matching lines @@
             'foobarbaz1@chromium.org',
             set(['24182']),
             True))
 
     def test_commit_message(self):
         author = "foo@chromium.org"
         revision = 1234
         commit = "abcd567"
         bugs = set()
         self.assertEqual(self.command.commit_message(author, revision, commit, bugs),
-                         """Auto-rebaseline for r1234
-
-https://chromium.googlesource.com/chromium/src/+/abcd567
-
-TBR=foo@chromium.org
-""")
+                         'Auto-rebaseline for r1234\n\n'
+                         'https://chromium.googlesource.com/chromium/src/+/abcd567\n\n'
+                         'TBR=foo@chromium.org\n')
 
         bugs = set(["234", "345"])
         self.assertEqual(self.command.commit_message(author, revision, commit, bugs),
-                         """Auto-rebaseline for r1234
+                         'Auto-rebaseline for r1234\n\n'
+                         'https://chromium.googlesource.com/chromium/src/+/abcd567\n\n'
+                         'BUG=234,345\n'
+                         'TBR=foo@chromium.org\n')
 
-https://chromium.googlesource.com/chromium/src/+/abcd567
-
-BUG=234,345
-TBR=foo@chromium.org
-""")
+        self.tool.environ['BUILDBOT_MASTERNAME'] = 'my.master'
+        self.tool.environ['BUILDBOT_BUILDERNAME'] = 'b'
+        self.tool.environ['BUILDBOT_BUILDNUMBER'] = '123'
+        self.assertEqual(self.command.commit_message(author, revision, commit, bugs),
+                         'Auto-rebaseline for r1234\n\n'
+                         'Build: https://build.chromium.org/p/my.master/builders/b/builds/123\n\n'
+                         'https://chromium.googlesource.com/chromium/src/+/abcd567\n\n'
+                         'BUG=234,345\n'
+                         'TBR=foo@chromium.org\n')
 
     def test_no_needs_rebaseline_lines(self):
         def blame(_):
             return """
 6469e754a1 path/to/TestExpectations                   (<foobarbaz1@chromium.org> 2013-06-14 20:18:46 +0000   11) crbug.com/24182 [ Debug ] path/to/norebaseline.html [ Failure ]
 """
         self.tool.scm().blame = blame
 
         self._execute_with_mock_options()
         self.assertEqual(self.tool.executive.calls, [])
@@ skipping 389 matching lines @@
 
     def test_execute_with_dry_run(self):
         self._basic_execute_test([], dry_run=True)
         self.assertEqual(self.tool.scm().local_commits(), [])
 
     def test_bot_revision_data(self):
         self._setup_mock_build_data()
         self.assertEqual(
             self.command.bot_revision_data(self.tool.scm()),
             [{'builder': 'MOCK Win7', 'revision': '9000'}])