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

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

Index: third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline_unittest.py
index 72ba0f54b727bdad95d4f132c94100932a34e6a1..98f9d71a5ce2325df3b57d8c2ac90fa584ffb382 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/tool/commands/auto_rebaseline_unittest.py
@@ -107,22 +107,26 @@ class TestAutoRebaseline(BaseTestCase):
         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
-
-https://chromium.googlesource.com/chromium/src/+/abcd567
-
-BUG=234,345
-TBR=foo@chromium.org
-""")
+                         'Auto-rebaseline for r1234\n\n'
+                         'https://chromium.googlesource.com/chromium/src/+/abcd567\n\n'
+                         'BUG=234,345\n'
+                         'TBR=foo@chromium.org\n')
+
+        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(_):