Do not set a distribution recalc flag when v1 shadow tree is added

third_party/WebKit/Source/core/dom/shadow/ElementShadow.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 10 matching lines @@
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "core/dom/shadow/ElementShadow.h"
 
 #include "core/css/StyleSheetList.h"
 #include "core/css/resolver/ScopedStyleResolver.h"
+#include "core/dom/NodeTraversal.h"
 #include "core/dom/StyleChangeReason.h"
 #include "core/dom/shadow/ElementShadowV0.h"
 #include "core/frame/Deprecation.h"
 #include "core/probe/CoreProbes.h"
 #include "platform/EventDispatchForbiddenScope.h"
 #include "platform/ScriptForbiddenScope.h"
 
 namespace blink {
 
 ElementShadow* ElementShadow::Create() {
@@ skipping 31 matching lines @@
       root->LazyReattachIfAttached();
   } else if (type == ShadowRootType::V0 || type == ShadowRootType::kUserAgent) {
     DCHECK(!element_shadow_v0_);
     element_shadow_v0_ = ElementShadowV0::Create(*this);
   }
 
   ShadowRoot* shadow_root = ShadowRoot::Create(shadow_host.GetDocument(), type);
   shadow_root->SetParentOrShadowHostNode(&shadow_host);
   shadow_root->SetParentTreeScope(shadow_host.GetTreeScope());
   AppendShadowRoot(*shadow_root);
-  SetNeedsDistributionRecalc();
+  if (type == ShadowRootType::V0) {
+    SetNeedsDistributionRecalc();
+  } else {
+    for (Node& child : NodeTraversal::ChildrenOf(shadow_host))
+      child.LazyReattachIfAttached();
+  }
 
   shadow_root->InsertedInto(&shadow_host);
   shadow_host.SetChildNeedsStyleRecalc();
   shadow_host.SetNeedsStyleRecalc(
       kSubtreeStyleChange,
       StyleChangeReasonForTracing::Create(StyleChangeReason::kShadow));
 
   probe::didPushShadowRoot(&shadow_host, shadow_root);
 
   return *shadow_root;
@@ skipping 71 matching lines @@
   visitor->Trace(element_shadow_v0_);
   visitor->Trace(shadow_root_);
 }
 
 DEFINE_TRACE_WRAPPERS(ElementShadow) {
   visitor->TraceWrappers(element_shadow_v0_);
   visitor->TraceWrappers(shadow_root_);
 }
 
 }  // namespace blink