Optimize collapsed border calculation (step 2)

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

Index: third_party/WebKit/Source/core/layout/LayoutTableBoxComponent.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableBoxComponent.cpp b/third_party/WebKit/Source/core/layout/LayoutTableBoxComponent.cpp
index f48eca2513c8176d9edf4e1affcb0fc5e4ab3df6..bf598f0b26b2f1c3fe4c391fb6d7190045a47d34 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableBoxComponent.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTableBoxComponent.cpp
@@ -10,17 +10,16 @@
 
 namespace blink {
 
-void LayoutTableBoxComponent::InvalidateCollapsedBordersOnStyleChange(
+bool LayoutTableBoxComponent::NeedsInvalidateCollapsedBordersOnStyleChange(
     const LayoutObject& table_part,
-    LayoutTable& table,
+    const LayoutTable& table,
     const StyleDifference& diff,
     const ComputedStyle& old_style) {
   if (!table.CollapseBorders())
-    return;
-  if (old_style.Border() != table_part.StyleRef().Border() ||
-      (diff.TextDecorationOrColorChanged() &&
-       table_part.StyleRef().HasBorderColorReferencingCurrentColor()))
-    table.InvalidateCollapsedBorders();
+    return false;
+  return old_style.Border() != table_part.StyleRef().Border() ||
+         (diff.TextDecorationOrColorChanged() &&
+          table_part.StyleRef().HasBorderColorReferencingCurrentColor());
 }
 
 bool LayoutTableBoxComponent::DoCellsHaveDirtyWidth(