Make flex-grow and flex-shrink interpolation continuous with 0

Source/core/css/resolver/AnimatedStyleBuilder.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * 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
@@ skipping 564 matching lines @@
     case CSSPropertyWebkitMaskPositionX:
         setOnFillLayers<CSSPropertyWebkitMaskPositionX>(style->accessMaskLayers(), value, state);
         return;
     case CSSPropertyWebkitMaskPositionY:
         setOnFillLayers<CSSPropertyWebkitMaskPositionY>(style->accessMaskLayers(), value, state);
         return;
     case CSSPropertyWebkitMaskSize:
         setOnFillLayers<CSSPropertyWebkitMaskSize>(style->accessMaskLayers(), value, state);
         return;
     case CSSPropertyPerspective:
-        style->setPerspective(clampTo<float>(toAnimatableDouble(value)->toDouble()));
+        style->setPerspective(value->isDouble() ? clampTo<float>(toAnimatableDouble(value)->toDouble()) : 0);
         return;
     case CSSPropertyPerspectiveOrigin:
         style->setPerspectiveOrigin(animatableValueToLengthPoint(value, state));
         return;
     case CSSPropertyShapeOutside:
         style->setShapeOutside(toAnimatableShapeValue(value)->shapeValue());
         return;
     case CSSPropertyShapeMargin:
         style->setShapeMargin(animatableValueToLength(value, state, ValueRangeNonNegative));
         return;
@@ skipping 86 matching lines @@
     case CSSPropertyRy:
         style->setRy(animatableValueToLength(value, state, ValueRangeNonNegative));
         return;
 
     default:
         ASSERT_NOT_REACHED();
     }
 }
 
 } // namespace blink