Support converting utf-16 files when importing w3c tests.

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

Index: third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_converter.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_converter.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_converter.py
index ef25fb91c9344e3a0863a1a1642d9149c8403c8c..060667d3ee4d5cd27b51a10e044673b700ac2ef0 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_converter.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/test_converter.py
@@ -47,7 +47,10 @@ def convert_for_webkit(new_path, filename, reference_support_info, host=Host()):
     if filename.endswith('.css'):
         return converter.add_webkit_prefix_to_unprefixed_properties(contents.decode('utf-8'))
     else:
-        converter.feed(contents.decode('utf-8'))
+        try:
+            converter.feed(contents.decode('utf-8'))
+        except UnicodeDecodeError:
+            converter.feed(contents.decode('utf-16'))
         converter.close()
         return converter.output()