Be more restrictive about forcing relayout of children for pagination.

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

Index: third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
index 5e2aa45b1220394594c2aa91ab356a823d27322b..7e6e0ea4d9d8bc03a1e7226a5da400d98d7016cf 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBlockFlow.cpp
@@ -455,11 +455,6 @@ void LayoutBlockFlow::layoutBlock(bool relayoutChildren) {
   while (!done)
     done = layoutBlockFlow(relayoutChildren, pageLogicalHeight, layoutScope);
 
-  LayoutView* layoutView = view();
-  if (layoutView->layoutState()->pageLogicalHeight())
-    setPageLogicalOffset(
-        layoutView->layoutState()->pageLogicalOffset(*this, logicalTop()));
-
   updateLayerTransformAfterLayout();
 
   updateAfterLayout();
@@ -780,10 +775,12 @@ bool LayoutBlockFlow::positionAndLayoutOnceIfNeeded(
     }
   }
 
-  if (!child.needsLayout())
-    return false;
-  child.layout();
-  return true;
+  bool neededLayout = child.needsLayout();
+  if (neededLayout)
+    child.layout();
+  if (view()->layoutState()->isPaginated())
+    updateFragmentationInfoForChild(child);
+  return neededLayout;
 }
 
 void LayoutBlockFlow::insertForcedBreakBeforeChildIfNeeded(