Remove sparsity tolerance check when considering squashing layers

sky/engine/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 40 matching lines @@
         "Might overlap other composited content" },
     { CompositingReasonOverlap,
         "overlap",
         "Overlaps other composited content" },
     { CompositingReasonNegativeZIndexChildren,
         "negativeZIndexChildren",
         "Parent with composited negative z-index content" },
     { CompositingReasonScrollsWithRespectToSquashingLayer,
         "scrollsWithRespectToSquashingLayer",
         "Cannot be squashed since this layer scrolls with respect to the squashing layer" },
-    { CompositingReasonSquashingSparsityExceeded,
-        "squashingSparsityExceeded",
-        "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,
@@ 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