Don't allow subsequence caching for fragmented PaintLayers.

third_party/WebKit/Source/core/paint/PaintLayerTest.cpp

 // Copyright 2016 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 "core/paint/PaintLayer.h"
 
 #include "core/html/HTMLIFrameElement.h"
 #include "core/layout/LayoutBoxModelObject.h"
 #include "core/layout/LayoutTestHelper.h"
 #include "core/layout/LayoutView.h"
@@ skipping 311 matching lines @@
 TEST_P(PaintLayerTest, SubsequenceCachingSVGRoot) {
   SetBodyInnerHTML(
       "<div id='parent' style='position: relative'>"
       "  <svg id='svgroot' style='position: relative'></svg>"
       "</div>");
 
   PaintLayer* svgroot = GetPaintLayerByElementId("svgroot");
   EXPECT_TRUE(svgroot->SupportsSubsequenceCaching());
 }
 
+TEST_P(PaintLayerTest, SubsequenceCachingMuticol) {
+  SetBodyInnerHTML(
+      "<div style='columns: 2'>"
+      "  <svg id='svgroot' style='position: relative'></svg>"
+      "</div>");
+
+  PaintLayer* svgroot = GetPaintLayerByElementId("svgroot");
+  EXPECT_FALSE(svgroot->SupportsSubsequenceCaching());
+}
+
 TEST_P(PaintLayerTest, HasDescendantWithClipPath) {
   SetBodyInnerHTML(
       "<div id='parent' style='position:relative'>"
       "  <div id='clip-path' style='clip-path: circle(50px at 0 100px)'>"
       "  </div>"
       "</div>");
   PaintLayer* parent = GetPaintLayerByElementId("parent");
   PaintLayer* clip_path = GetPaintLayerByElementId("clip-path");
 
   EXPECT_TRUE(parent->HasDescendantWithClipPath());
@@ skipping 676 matching lines @@
   RefPtr<ComputedStyle> old_style =
       ComputedStyle::Clone(target_object->StyleRef());
   ComputedStyle* new_style = target_object->MutableStyle();
   new_style->SetHasCurrentTransformAnimation();
   target_paint_layer->UpdateTransform(old_style.Get(), *new_style);
 
   EXPECT_NE(nullptr, target_paint_layer->Transform());
 }
 
 }  // namespace blink