Change ChromiumCommit.format_patch to use a filtered list of files

third_party/WebKit/Tools/Scripts/webkitpy/w3c/chromium_commit_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/w3c/chromium_commit_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/chromium_commit_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/chromium_commit_unittest.py
index 20fd78e95d0ca610e65321d6f5347196b99bc79d..2304b45261302ca0648d435fd4ba1cb97539becf 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/chromium_commit_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/chromium_commit_unittest.py
@@ -6,6 +6,8 @@ import unittest
 from webkitpy.common.host_mock import MockHost
 from webkitpy.common.system.executive_mock import MockExecutive2
 from webkitpy.w3c.chromium_commit import ChromiumCommit
+from webkitpy.w3c.test_exporter import CHROMIUM_WPT_DIR
+from webkitpy.w3c.test_exporter_unittest import mock_command_exec
 
 
 class ChromiumCommitTest(unittest.TestCase):
@@ -24,3 +26,24 @@ class ChromiumCommitTest(unittest.TestCase):
 
         self.assertEqual(chromium_commit.position, 'refs/heads/master@{#789}')
         self.assertEqual(chromium_commit.sha, 'deadbeefcafe')
+
+    def test_filtered_changed_files_blacklist(self):
+        host = MockHost()
+
+        fake_files = ['file1', 'MANIFEST.json', 'file3']
+        qualified_fake_files = [CHROMIUM_WPT_DIR + f for f in fake_files]
+
+        host.executive = mock_command_exec({
+            'diff-tree': '\n'.join(qualified_fake_files),
+            'crrev-parse': 'fake rev',
+        })
+
+        position_footer = 'Cr-Commit-Position: refs/heads/master@{#789}'
+        chromium_commit = ChromiumCommit(host, position=position_footer)
+
+        files = chromium_commit.filtered_changed_files()
+
+        expected_files = ['file1', 'file3']
+        qualified_expected_files = [CHROMIUM_WPT_DIR + f for f in expected_files]
+
+        self.assertEqual(files, qualified_expected_files)