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 298 matching lines @@
     if (current->isSVGResourceContainer()) {
       // This will process the rest of the ancestors.
       toLayoutSVGResourceContainer(current)->removeAllClientsFromCache();
       break;
     }
 
     current = current->parent();
   }
 }
 
+void LayoutSVGResourceContainer::markForLayoutAndParentResourceInvalidation(

[fs, 2017/02/06 10:17:35]

The way this is written it doesn't need to duplicate the other
markForLayoutAndParentResourceInvalidation, but can be written as a separate
method. I.e something like:

bool needsLayout = diff.needsPaintInvalidation() &&
isChildOfResourceContainer(object);

which then feeds into the other ("old") function.

+    LayoutObject* object,
+    StyleDifference diff) {
+  DCHECK(object);
+  DCHECK(object->node());
+
+  bool needsLayout = false;
+
+  LayoutObject* current = object;
+  while (current) {
+    if (current->isSVGResourceContainer()) {
+      needsLayout = diff.needsPaintInvalidation();
+      break;
+    }
+    current = current->parent();
+  }
+
+  if (needsLayout && !object->documentBeingDestroyed()) {
+    object->setNeedsLayoutAndFullPaintInvalidation(
+        LayoutInvalidationReason::SvgResourceInvalidated);
+  }
+
+  removeFromCacheAndInvalidateDependencies(object, needsLayout);
+
+  // Invalidate resources in ancestor chain, if needed.
+  current = object->parent();
+  while (current) {
+    removeFromCacheAndInvalidateDependencies(current, needsLayout);
+
+    if (current->isSVGResourceContainer()) {
+      // This will process the rest of the ancestors.
+      toLayoutSVGResourceContainer(current)->removeAllClientsFromCache();
+      break;
+    }
+
+    current = current->parent();
+  }
+}
+
 }  // namespace blink