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

third_party/WebKit/Source/core/layout/svg/SVGResourcesCache.cpp

 /*
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 110 matching lines @@
   // recompute the associated resources for a LayoutObject.
   // TODO(fs): Avoid passing in a useless StyleDifference, but instead compare
   // oldStyle/newStyle to see which resources changed to be able to selectively
   // rebuild individual resources, instead of all of them.
   if (layoutObjectCanHaveResources(layoutObject)) {
     SVGResourcesCache& cache = resourcesCache(layoutObject->document());
     cache.removeResourcesFromLayoutObject(layoutObject);
     cache.addResourcesFromLayoutObject(layoutObject, newStyle);
   }
 
+  bool needLayout = false;
+  needLayout |= diff.needsPaintInvalidation();

[fs, 2017/01/23 13:03:40]

Now we'll trigger a lot more layout than we need to. We don't want to do that.
This is why I suggested (I think) that we pass the StyleDifference to
markForLayoutAndParentResourceInvalidation, and then use that in the relevant
call when we know we're a descendant of a LayoutSVGResourceContainer.

+
   LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
-      layoutObject, false);
+      layoutObject, needLayout);
 }
 
 void SVGResourcesCache::clientWasAddedToTree(LayoutObject* layoutObject,
                                              const ComputedStyle& newStyle) {
   if (!layoutObject->node())
     return;
   LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(
       layoutObject, false);
 
   if (!layoutObjectCanHaveResources(layoutObject))
@@ skipping 19 matching lines @@
   ASSERT(layoutObject);
 
   SVGResources* resources = cachedResourcesForLayoutObject(layoutObject);
   if (resources)
     resources->removeClientFromCache(layoutObject);
   SVGResourcesCache& cache = resourcesCache(layoutObject->document());
   cache.removeResourcesFromLayoutObject(layoutObject);
 }
 
 }  // namespace blink