Simplify whitespace layout object creation.

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

Index: third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.cpp
diff --git a/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.cpp b/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.cpp
index a9a0a1965dee92ade95f1b764876bf2e9a11a4b6..048e58567be297b494319a8a537471e206c3a632 100644
--- a/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.cpp
+++ b/third_party/WebKit/Source/core/dom/LayoutTreeBuilderTraversal.cpp
@@ -250,7 +250,7 @@ static LayoutObject* nextSiblingLayoutObjectInternal(Node* node,
           pseudoAwareFirstChild(*sibling), limit);
       if (layoutObject)
         return layoutObject;
-      if (!limit)
+      if (limit == -1)
         return nullptr;
     }
 
@@ -270,7 +270,7 @@ LayoutObject* LayoutTreeBuilderTraversal::nextSiblingLayoutObject(
     return sibling;
 
   Node* parent = LayoutTreeBuilderTraversal::parent(node);
-  while (limit && parent && hasDisplayContentsStyle(*parent)) {
+  while (limit != -1 && parent && hasDisplayContentsStyle(*parent)) {
     if (LayoutObject* sibling =
             nextSiblingLayoutObjectInternal(nextSibling(*parent), limit))
       return sibling;
@@ -296,7 +296,7 @@ static LayoutObject* previousSiblingLayoutObjectInternal(Node* node,
           pseudoAwareLastChild(*sibling), limit);
       if (layoutObject)
         return layoutObject;
-      if (!limit)
+      if (limit == -1)
         return nullptr;
     }
 
@@ -309,20 +309,31 @@ static LayoutObject* previousSiblingLayoutObjectInternal(Node* node,
 
 LayoutObject* LayoutTreeBuilderTraversal::previousSiblingLayoutObject(
     const Node& node,
-    int32_t limit) {
+    int32_t limit,
+    bool* ranOutOfSiblings) {
   DCHECK(limit == kTraverseAllSiblings || limit >= 0) << limit;
+  DCHECK(!ranOutOfSiblings || limit >= 0) << limit;
+  if (ranOutOfSiblings)
+    *ranOutOfSiblings = false;
+
   if (LayoutObject* sibling =
-          previousSiblingLayoutObjectInternal(previousSibling(node), limit))
+          previousSiblingLayoutObjectInternal(previousSibling(node), limit)) {
     return sibling;
+  }
 
   Node* parent = LayoutTreeBuilderTraversal::parent(node);
-  while (limit && parent && hasDisplayContentsStyle(*parent)) {
+  while (limit != -1 && parent && hasDisplayContentsStyle(*parent)) {
     if (LayoutObject* sibling = previousSiblingLayoutObjectInternal(
             previousSibling(*parent), limit))
       return sibling;
     parent = LayoutTreeBuilderTraversal::parent(*parent);
   }
 
+  if (ranOutOfSiblings) {
+    DCHECK_GE(limit, -1);
+    *ranOutOfSiblings = limit == -1;
+  }
+
   return nullptr;
 }