Support generating enums shared by multiple ComputedStyle fields.

third_party/WebKit/Source/build/scripts/make_computed_style_base.py

Index: third_party/WebKit/Source/build/scripts/make_computed_style_base.py
diff --git a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
index 4c8b27ced7a3fddc5c0501bb3344a28959ebb64d..6182207b1c3bc0ae8ecdffa1f663e2445d4e6290 100755
--- a/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
+++ b/third_party/WebKit/Source/build/scripts/make_computed_style_base.py
@@ -88,6 +88,14 @@ def _create_enums(properties):
             enum_name = property_['type_name']
             # From the Blink style guide: Enum members should use InterCaps with an initial capital letter. [names-enum-members]
             enum_values = [('k' + camel_case(k)) for k in property_['keywords']]
+
+            if enum_name in enums:
+                # There's an enum with the same name, check if the enum values are the same
+                assert set(enums[enum_name]) == set(enum_values), \
+                    ("'{}' can't have type_name '{}' ".format(property_['name'], enum_name) +

[sashab, 2017/02/07 02:59:27]

Can you just use + property['name'] and + enum_name, might look simpler

[shend, 2017/02/07 21:44:02]

done.

+                     "because it was used by a previous property, but with a different set of keywords. "
+                     "Either give it a different name or ensure the keywords are the same.")
+
             enums[enum_name] = enum_values
 
     return enums