Disallow squashing for layers with reflections

Source/core/rendering/compositing/CompositingLayerAssigner.cpp

Index: Source/core/rendering/compositing/CompositingLayerAssigner.cpp
diff --git a/Source/core/rendering/compositing/CompositingLayerAssigner.cpp b/Source/core/rendering/compositing/CompositingLayerAssigner.cpp
index 1c4089d6d3ed22f3c8542cf4396ec81f80fa34eb..6f47fe36b881ed44701c6ac532dfbcb2cf160265 100644
--- a/Source/core/rendering/compositing/CompositingLayerAssigner.cpp
+++ b/Source/core/rendering/compositing/CompositingLayerAssigner.cpp
@@ -134,7 +134,10 @@ CompositingReasons CompositingLayerAssigner::getReasonsPreventingSquashing(const
     // Don't squash iframes, frames or plugins.
     // FIXME: this is only necessary because there is frame code that assumes that composited frames are not squashed.
     if (layer->renderer()->isRenderPart())
-        return CompositedReasonSquashingRenderPart;
+        return CompositingReasonSquashingRenderPartIsDisallowed;
+
+    if (layer->reflectionInfo())
+        return CompositingReasonSquashingReflectionIsDisallowed;
 
     if (squashingWouldExceedSparsityTolerance(layer, squashingState))
         return CompositingReasonSquashingSparsityExceeded;