Don't squash layers that have filters.

Source/platform/graphics/CompositingReasons.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "config.h"
 #include "platform/graphics/CompositingReasons.h"
 
 #include "wtf/StdLibExtras.h"
 
 namespace blink {
@@ skipping 61 matching lines @@
         "Cannot be squashed as the squashing layer would become too sparse" },
     { CompositingReasonSquashingClippingContainerMismatch,
         "squashingClippingContainerMismatch",
         "Cannot be squashed because this layer has a different clipping container than the squashing layer" },
     { CompositingReasonSquashingOpacityAncestorMismatch,
         "squashingOpacityAncestorMismatch",
         "Cannot be squashed because this layer has a different opacity ancestor than the squashing layer" },
     { CompositingReasonSquashingTransformAncestorMismatch,
         "squashingTransformAncestorMismatch",
         "Cannot be squashed because this layer has a different transform ancestor than the squashing layer" },
-    { CompositingReasonSquashingFilterAncestorMismatch,
+    { CompositingReasonSquashingFilterMismatch,
         "squashingFilterAncestorMismatch",
-        "Cannot be squashed because this layer has a different filter ancestor than the squashing layer" },
+        "Cannot be squashed because this layer has a different filter ancestor than the squashing layer, or this layer has a filter" },
     { CompositingReasonSquashingWouldBreakPaintOrder,
         "squashingWouldBreakPaintOrder",
         "Cannot be squashed without breaking paint order" },
     { CompositingReasonSquashingVideoIsDisallowed,
         "squashingVideoIsDisallowed",
         "Squashing video is not supported" },
     { CompositingReasonSquashedLayerClipsCompositingDescendants,
         "squashedLayerClipsCompositingDescendants",
         "Squashing a layer that clips composited descendants is not supported." },
     { CompositingReasonSquashingRenderPartIsDisallowed,
@@ skipping 87 matching lines @@
         "layerForScrollingBlockSelection",
         "Secondary layer, to house block selection gaps for composited scrolling with no scrolling contents" },
     { CompositingReasonInlineTransform,
         "inlineTransform",
         "Has an inline transform, which causes subsequent layers to assume overlap" },
 };
 
 size_t kNumberOfCompositingReasons = WTF_ARRAY_LENGTH(kCompositingReasonStringMap);
 
 } // namespace blink