Animations: Smooth interpolation for scale none

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

Index: third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
diff --git a/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp b/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
index 710af227536c2c89fc686705c72fb0a2f8e9d38f..97d0bf45f000bfeb95e81df3908fd38824c823c5 100644
--- a/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
+++ b/third_party/WebKit/Source/core/css/resolver/AnimatedStyleBuilder.cpp
@@ -299,6 +299,8 @@ TransformOperation* animatableValueToTransformOperation(
     TransformOperation::OperationType type) {
   const TransformOperations& transformList =
       toAnimatableTransform(value)->transformOperations();
+  if (transformList.size() == 0)
+    return nullptr;
   ASSERT(transformList.size() == 1);
   ASSERT(transformList.operations()[0].get()->type() == type);
   return transformList.operations()[0].get();