Fix up that no render SVG shape when change clip-path to visible after hidden.

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 1523 matching lines @@
         // underlines).
         || (isText() && !isBR() && toLayoutText(this)->hasTextBoxes())
         // Caret is painted in text color.
         || (isLayoutBlock() && toLayoutBlock(this)->hasCaret()) ||
         (isSVG() && style()->svgStyle().isFillColorCurrentColor()) ||
         (isSVG() && style()->svgStyle().isStrokeColorCurrentColor()) ||
         isListMarker())
       diff.setNeedsPaintInvalidationObject();
   }
 
+  if (!diff.needsPaintInvalidation() && isSVG() && hasClipPath() &&

[fs, 2016/11/07 12:03:30]

Neither does this (very/overly case-specific.)

+      style()->visibility() == EVisibility::Visible)
+    diff.setNeedsPaintInvalidationObject();
+
   // The answer to layerTypeRequired() for plugins, iframes, and canvas can
   // change without the actual style changing, since it depends on whether we
   // decide to composite these elements. When the/ layer status of one of these
   // elements changes, we need to force a layout.
   if (!diff.needsFullLayout() && style() && isBoxModelObject()) {
     bool requiresLayer =
         toLayoutBoxModelObject(this)->layerTypeRequired() != NoPaintLayer;
     if (hasLayer() != requiresLayer)
       diff.setNeedsFullLayout();
   }
@@ skipping 2001 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif