Optimize collapsed border calculation (step 1)

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

Index: third_party/WebKit/Source/core/layout/LayoutTableCellTest.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableCellTest.cpp b/third_party/WebKit/Source/core/layout/LayoutTableCellTest.cpp
index b01ea27993c43b8fa7dd825378911a25de23de48..99b80a6cfbac67a2c5b8653f5a92aa66d06c054c 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableCellTest.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutTableCellTest.cpp
@@ -85,6 +85,15 @@ class LayoutTableCellTest : public RenderingTest {
   }
 };
 
+TEST_F(LayoutTableCellTest, AbsoluteColumnIndex) {
+  auto* cell = LayoutTableCell::CreateAnonymous(&GetDocument());
+  EXPECT_FALSE(cell->HasSetAbsoluteColumnIndex());
+  cell->SetAbsoluteColumnIndex(kMaxColumnIndex);
+  EXPECT_TRUE(cell->HasSetAbsoluteColumnIndex());
+  EXPECT_NE(kUnsetColumnIndex, cell->AbsoluteColumnIndex());
+  EXPECT_EQ(kMaxColumnIndex, cell->AbsoluteColumnIndex());
+}
+
 TEST_F(LayoutTableCellTest, ResetColspanIfTooBig) {
   SetBodyInnerHTML("<table><td id='cell' colspan='14000'></td></table>");
   ASSERT_EQ(GetCellByElementId("cell")->ColSpan(), 8190U);