[css-tables] Set table and cell widths dirty when section border changes

third_party/WebKit/Source/core/style/BorderData.h

Index: third_party/WebKit/Source/core/style/BorderData.h
diff --git a/third_party/WebKit/Source/core/style/BorderData.h b/third_party/WebKit/Source/core/style/BorderData.h
index eedc12a81742b7b946282c561e6307420d6b1a00..7bdb4d3e9e1259665a119a01391b1cec554e938e 100644
--- a/third_party/WebKit/Source/core/style/BorderData.h
+++ b/third_party/WebKit/Source/core/style/BorderData.h
@@ -124,6 +124,14 @@ public:
         return !(*this == o);
     }
 
+    bool sizeEquals(const BorderData& o) const
+    {
+        return borderLeftWidth() != o.borderLeftWidth()
+            || borderTopWidth() != o.borderTopWidth()
+            || borderRightWidth() != o.borderRightWidth()
+            || borderBottomWidth() != o.borderBottomWidth();
+    }
+
     const BorderValue& left() const { return m_left; }
     const BorderValue& right() const { return m_right; }
     const BorderValue& top() const { return m_top; }