Remove the forced layout in getComputedStyle for elements in Shadow DOM

third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.h

Index: third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.h
diff --git a/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.h b/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.h
index 39bb2e0ee44c5ce46183e3fd80aee1aa31d27465..455406043765e70bbd237d9914a22c99daaca098 100644
--- a/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.h
+++ b/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.h
@@ -40,21 +40,21 @@ namespace LayoutTreeBuilderTraversal {
 class ParentDetails {
     STACK_ALLOCATED();

[rune, 2016/02/01 09:24:23]

Is this also WTF_MAKE_NONCOPYABLE? Not that I think it needs to be, just to
express the current use pattern?

 public:
-    ParentDetails()
-        : m_insertionPoint(nullptr)
-    { }
+    bool wasDistributedToInsertionPoint() const { return m_wasDistributedToInsertionPoint; }
+    void didTraverseInsertionPoint() { m_wasDistributedToInsertionPoint = true; }
 
-    const InsertionPoint* insertionPoint() const { return m_insertionPoint; }
+    const ShadowRoot* shadowRoot() const { return m_shadowRoot; }
+    void didTraverseShadowRoot(const ShadowRoot* shadowRoot) { m_shadowRoot = shadowRoot; }
 
-    void didTraverseInsertionPoint(const InsertionPoint*);
-
-    bool operator==(const ParentDetails& other)

[rune, 2016/02/01 09:24:23]

Are objects of this class ever being compared? Does it make sense to make
operator== delete?

+    void reset()
     {
-        return m_insertionPoint == other.m_insertionPoint;
+        m_wasDistributedToInsertionPoint = false;
+        m_shadowRoot = nullptr;
     }
 
 private:
-    RawPtrWillBeMember<const InsertionPoint> m_insertionPoint;
+    bool m_wasDistributedToInsertionPoint = false;
+    RawPtrWillBeMember<const ShadowRoot> m_shadowRoot = nullptr;
 };
 
 CORE_EXPORT ContainerNode* parent(const Node&, ParentDetails* = 0);