Disable wdiff on Windows.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/win.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/win.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/win.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/win.py
index bc8ec2a44b4bbadaa75a841f75a0b485e9656fdb..3494b999cabe97a4c527bc0377da9ce757b47b25 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/win.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/win.py
@@ -227,7 +227,10 @@ class WinPort(base.Port):
         return self._build_path(binary_name)
 
     def _path_to_wdiff(self):
-        return self.path_from_chromium_base('third_party', 'cygwin', 'bin', 'wdiff.exe')
+        # Temporarily disabling wdiff on Windows to see how this affects
+        # the rate of layout test hanging on try bots (http://crbug.com/637478).
+        # TODO(qyearsley): Re-enable this when possible.
+        return None

[qyearsley, 2016/12/06 01:46:59]

Note, there are also other ways to disable wdiff temporarily, including changing
the place where it's invoked in the base Port class
(https://cs.chromium.org/chromium/src/third_party/WebKit/Tools/Scripts/webkitp...),
let me know if there's a better way to do it than this :-)

 
     def _check_crash_service_available(self):
         """Checks whether the crash service binary is present."""