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

third_party/WebKit/Source/core/layout/svg/LayoutSVGResourceContainer.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 291 matching lines @@
   removeFromCacheAndInvalidateDependencies(object, needsLayout);
 
   // Invalidate resources in ancestor chain, if needed.
   LayoutObject* current = object->parent();
   while (current) {
     removeFromCacheAndInvalidateDependencies(current, needsLayout);
 
     if (current->isSVGResourceContainer()) {
       // This will process the rest of the ancestors.
       toLayoutSVGResourceContainer(current)->removeAllClientsFromCache();
+
+      LayoutSVGResourceContainer* container =

[fs, 2017/01/19 13:24:41]

The line just above here will call markAllClientsForInvalidation, which will
iterate all clients and essentially propagate the "needs layout" signal. So, I
suspect the InvalidationMode passed there is not "strong" enough, and should
have been "upgraded" on the way. So maybe all that's needed is to pass 'true' to
the removeAllClientsFromCache call above to make this work? (Preferably that
should be conditionalized on something too.)

+          toLayoutSVGResourceContainer(current);
+
+      if (object->style()->visibility() == EVisibility::kVisible) {
+        for (auto client : container->clients()) {
+          LayoutRect boundingBox = client->visualRect();
+          if (client->style()->visibility() == EVisibility::kVisible &&
+                !boundingBox.width() && !boundingBox.height()) {
+            client->setNeedsLayout(
+                LayoutInvalidationReason::SvgResourceInvalidated);
+          }
+        }
+      }
+
       break;
     }
 
     current = current->parent();
   }
 }
 
 }  // namespace blink