Only allow subsequence caching for SVG documents, not inline SVG.

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 308 matching lines @@
   EXPECT_TRUE(grandchild1->SupportsSubsequenceCaching());
 }
 
 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());
+  EXPECT_FALSE(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());
@@ skipping 688 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