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

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

 /*
  * Copyright (C) 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
@@ skipping 2754 matching lines @@
   return (Transform() ||
           GetLayoutObject().Style()->GetPosition() == EPosition::kFixed) &&
          ((global_paint_flags & kGlobalPaintFlattenCompositingLayers) ||
           GetCompositingState() != kPaintsIntoOwnBacking);
 }
 
 bool PaintLayer::SupportsSubsequenceCaching() const {
   if (EnclosingPaginationLayer())
     return false;
 
-  // SVG paints atomically.
-  if (GetLayoutObject().IsSVGRoot())
+  // SVG documents paint atomically.
+  if (GetLayoutObject().IsSVGRoot() &&
+      GetLayoutObject().GetDocument().IsSVGDocument())
     return true;
 
   // Create subsequence for only stacking contexts whose painting are atomic.
   if (!StackingNode()->IsStackingContext())
     return false;
 
   // The layer doesn't have children. Subsequence caching is not worth it,
   // because normally the actual painting will be cheap.
   // SVG is also painted atomically.
   if (!PaintLayerStackingNodeIterator(*StackingNode(), kAllChildren).Next())
@@ skipping 541 matching lines @@
 }
 
 void showLayerTree(const blink::LayoutObject* layoutObject) {
   if (!layoutObject) {
     LOG(INFO) << "Cannot showLayerTree. Root is (nil)";
     return;
   }
   showLayerTree(layoutObject->EnclosingLayer());
 }
 #endif