CSS Animations: Clamp to avoid underflow when blending unsigned values

Source/core/platform/animation/AnimationUtilities.h

Index: Source/core/platform/animation/AnimationUtilities.h
diff --git a/Source/core/platform/animation/AnimationUtilities.h b/Source/core/platform/animation/AnimationUtilities.h
index 4cdc8291a5e8f3fc7fdc75914b703d0a5db630e0..4c86e770b432459036debc7e8293ba356215aef6 100644
--- a/Source/core/platform/animation/AnimationUtilities.h
+++ b/Source/core/platform/animation/AnimationUtilities.h
@@ -39,7 +39,7 @@ inline int blend(int from, int to, double progress)
 
 inline unsigned blend(unsigned from, unsigned to, double progress)
 {
-    return lround(to > from ? from + (to - from) * progress : from - (from - to) * progress);
+    return clampTo<unsigned>(round(to > from ? from + (to - from) * progress : from - (from - to) * progress));
 }
 
 inline double blend(double from, double to, double progress)