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

Source/core/css/resolver/AnimatedStyleBuilder.cpp

Index: Source/core/css/resolver/AnimatedStyleBuilder.cpp
diff --git a/Source/core/css/resolver/AnimatedStyleBuilder.cpp b/Source/core/css/resolver/AnimatedStyleBuilder.cpp
index 55985c231d5c3d2491d2adfde1f1edbfbaf67523..76ae3865e7519f0f2082e9893f973541653bd17a 100644
--- a/Source/core/css/resolver/AnimatedStyleBuilder.cpp
+++ b/Source/core/css/resolver/AnimatedStyleBuilder.cpp
@@ -582,7 +582,7 @@ void AnimatedStyleBuilder::applyProperty(CSSPropertyID property, StyleResolverSt
         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));