Ensure text nodes get an object if we're unsure that they will be collapsed

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

Index: third_party/WebKit/Source/core/dom/Text.cpp
diff --git a/third_party/WebKit/Source/core/dom/Text.cpp b/third_party/WebKit/Source/core/dom/Text.cpp
index 0ee207e66957876b84cb5180c3794fa65e837715..882316329913eeecf9d5551bf0af3b1bb50c8cce 100644
--- a/third_party/WebKit/Source/core/dom/Text.cpp
+++ b/third_party/WebKit/Source/core/dom/Text.cpp
@@ -307,9 +307,15 @@ bool Text::textLayoutObjectIsNeeded(const ComputedStyle& style, const LayoutObje
         while (first && first->isFloatingOrOutOfFlowPositioned() && maxSiblingsToVisit--)
             first = first->nextSibling();
         if (!first || first == layoutObject() || LayoutTreeBuilderTraversal::nextSiblingLayoutObject(*this) == first) {
+            // If we're adding children to this flow our previous siblings are not in the layout tree yet so we
+            // cannot know if we will be the first child in the line and collapse away. We have to assume we need a layout object.
+            Node* firstChildNode = parent.node() ? LayoutTreeBuilderTraversal::firstChild(*parent.node()) : nullptr;
+            if (first && first == layoutObject() && firstChildNode && !firstChildNode->layoutObject())
+                return true;
+
             // Whitespace at the start of a block just goes away.  Don't even
             // make a layout object for this text.
-            return false;
+            return !firstChildNode;
         }
     }
     return true;