Adds filter support for offscreen canvas

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 140 matching lines @@
                                               fragmentIdentifier);
   }
   DCHECK(value.isIdentifierValue() &&
          toCSSIdentifierValue(value).getValueID() == CSSValueNone);
   return nullptr;
 }
 
 FilterOperations StyleBuilderConverter::convertFilterOperations(
     StyleResolverState& state,
     const CSSValue& value) {
-  return FilterOperationResolver::createFilterOperations(state, value);
+  return FilterOperationResolver::createFilterOperations(&state, value);
 }
 
 static FontDescription::GenericFamilyType convertGenericFamily(
     CSSValueID valueID) {
   switch (valueID) {
     case CSSValueWebkitBody:
       return FontDescription::StandardFamily;
     case CSSValueSerif:
       return FontDescription::SerifFamily;
     case CSSValueSansSerif:
@@ skipping 1124 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