Clamp filter functions {grayscale, invert, opacity, sepia} to 100%

third_party/WebKit/Source/core/css/parser/CSSPropertyParser.cpp

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSPropertyParser.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/css/CSSBasicShapeValues.h"
 #include "core/css/CSSBorderImage.h"
 #include "core/css/CSSContentDistributionValue.h"
@@ skipping 1437 matching lines @@
         } else if (filterType == CSSValueHueRotate) {
             parsedValue = consumeAngle(args);
         } else if (filterType == CSSValueBlur) {
             parsedValue = consumeLength(args, HTMLStandardMode, ValueRangeNonNegative);
         } else {
             // FIXME (crbug.com/397061): Support calc expressions like calc(10% + 0.5)
             parsedValue = consumePercent(args, ValueRangeNonNegative);
             if (!parsedValue)
                 parsedValue = consumeNumber(args, ValueRangeNonNegative);
             if (parsedValue && filterType != CSSValueSaturate && filterType != CSSValueContrast) {
-                double maxAllowed = toCSSPrimitiveValue(parsedValue)->isPercentage() ? 100.0 : 1.0;
-                if (toCSSPrimitiveValue(parsedValue)->getDoubleValue() > maxAllowed)
-                    return nullptr;
+                bool isPercentage = toCSSPrimitiveValue(parsedValue)->isPercentage();
+                double maxAllowed = isPercentage ? 100.0 : 1.0;
+                if (toCSSPrimitiveValue(parsedValue)->getDoubleValue() > maxAllowed) {
+                    parsedValue = CSSPrimitiveValue::create(
+                        maxAllowed,
+                        isPercentage ? CSSPrimitiveValue::UnitType::Percentage : CSSPrimitiveValue::UnitType::Number);
+                }
             }
         }
     }
     if (!parsedValue || !args.atEnd())
         return nullptr;
     filterValue->append(parsedValue);
     return filterValue;
 }
 
 static CSSValue* consumeFilter(CSSParserTokenRange& range, CSSParserMode cssParserMode)
@@ skipping 3720 matching lines @@
     case CSSPropertyGridTemplate:
         return consumeGridTemplateShorthand(CSSPropertyGridTemplate, important);
     case CSSPropertyGrid:
         return consumeGridShorthand(important);
     default:
         return false;
     }
 }
 
 } // namespace blink