Be more restrictive about forcing relayout of children for pagination.

third_party/WebKit/Source/core/layout/LayoutDeprecatedFlexibleBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutDeprecatedFlexibleBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutDeprecatedFlexibleBox.cpp b/third_party/WebKit/Source/core/layout/LayoutDeprecatedFlexibleBox.cpp
index 2a6ac0ce733c96b8970fa8b93f16b9fc3d1f9053..00be42e62b562a3327660e22f3a59bd251774874 100644
--- a/third_party/WebKit/Source/core/layout/LayoutDeprecatedFlexibleBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutDeprecatedFlexibleBox.cpp
@@ -404,10 +404,6 @@ void LayoutDeprecatedFlexibleBox::layoutBlock(bool relayoutChildren) {
   updateLayerTransformAfterLayout();
   updateAfterLayout();
 
-  if (view()->layoutState()->pageLogicalHeight())
-    setPageLogicalOffset(
-        view()->layoutState()->pageLogicalOffset(*this, logicalTop()));
-
   clearNeedsLayout();
 }
 
@@ -445,6 +441,7 @@ void LayoutDeprecatedFlexibleBox::layoutHorizontalBox(bool relayoutChildren) {
   LayoutUnit yPos = borderTop() + paddingTop();
   LayoutUnit xPos = borderLeft() + paddingLeft();
   bool heightSpecified = false;
+  bool paginated = view()->layoutState()->isPaginated();
   LayoutUnit oldHeight;
 
   LayoutUnit remainingSpace;
@@ -514,6 +511,9 @@ void LayoutDeprecatedFlexibleBox::layoutHorizontalBox(bool relayoutChildren) {
         setHeight(std::max(size().height(), yPos + child->size().height() +
                                                 child->marginHeight()));
       }
+
+      if (paginated)
+        updateFragmentationInfoForChild(*child);
     }
 
     if (!iterator.first() && hasLineIfEmpty())
@@ -784,6 +784,7 @@ void LayoutDeprecatedFlexibleBox::layoutVerticalBox(bool relayoutChildren) {
   LayoutUnit toAdd =
       borderBottom() + paddingBottom() + horizontalScrollbarHeight();
   bool heightSpecified = false;
+  bool paginated = view()->layoutState()->isPaginated();
   LayoutUnit oldHeight;
 
   LayoutUnit remainingSpace;
@@ -882,6 +883,9 @@ void LayoutDeprecatedFlexibleBox::layoutVerticalBox(bool relayoutChildren) {
       placeChild(child, LayoutPoint(childX, size().height()));
       setHeight(size().height() + child->size().height() +
                 child->marginBottom());
+
+      if (paginated)
+        updateFragmentationInfoForChild(*child);
     }
 
     yPos = size().height();