CSS scale property: scale with one value only affects X

third_party/WebKit/Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 1232 matching lines @@
   return RotateTransformOperation::create(convertRotation(value),
                                           TransformOperation::Rotate3D);
 }
 
 PassRefPtr<ScaleTransformOperation> StyleBuilderConverter::convertScale(
     StyleResolverState& state,
     const CSSValue& value) {
   const CSSValueList& list = toCSSValueList(value);
   ASSERT(list.length() <= 3);
   double sx = toCSSPrimitiveValue(list.item(0)).getDoubleValue();
-  double sy = sx;
+  double sy = 1;
   double sz = 1;
   if (list.length() >= 2)
     sy = toCSSPrimitiveValue(list.item(1)).getDoubleValue();
   if (list.length() == 3)
     sz = toCSSPrimitiveValue(list.item(2)).getDoubleValue();
 
   return ScaleTransformOperation::create(sx, sy, sz,
                                          TransformOperation::Scale3D);
 }
 
@@ skipping 35 matching lines @@
       // Instead of the actual zoom, use 1 to avoid potential rounding errors
       Length length = primitiveValue.convertToLength(
           state.cssToLengthConversionData().copyWithAdjustedZoom(1));
       return *CSSPrimitiveValue::create(length, 1);
     }
   }
   return value;
 }
 
 }  // namespace blink