Animations: Smooth interpolation for translate none

third_party/WebKit/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 731 matching lines @@
       double destinationZoom = style->effectiveZoom();
       style->setTransform(sourceZoom == destinationZoom
                               ? operations
                               : operations.zoom(destinationZoom / sourceZoom));
       return;
     }
     case CSSPropertyTranslate: {
       TranslateTransformOperation* translate =
           toTranslateTransformOperation(animatableValueToTransformOperation(
               value, TransformOperation::Translate3D));
+      if (!translate) {
+        style->setTranslate(nullptr);
+        return;
+      }
       double sourceZoom = toAnimatableTransform(value)->zoom();
       double destinationZoom = style->effectiveZoom();
       style->setTranslate(
           sourceZoom == destinationZoom
               ? translate
               : translate->zoomTranslate(destinationZoom / sourceZoom));
       return;
     }
     case CSSPropertyRotate: {
       style->setRotate(
@@ skipping 89 matching lines @@
       style->setRy(
           animatableValueToLength(value, state, ValueRangeNonNegative));
       return;
 
     default:
       ASSERT_NOT_REACHED();
   }
 }
 
 }  // namespace blink