Update our treatment of repeating headers in tables

third_party/WebKit/Source/core/layout/LayoutTableSection.h

Index: third_party/WebKit/Source/core/layout/LayoutTableSection.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutTableSection.h b/third_party/WebKit/Source/core/layout/LayoutTableSection.h
index 8ff2023691d2d66cbccff14fe388ccd92f8bac9f..f834458d28a381cd4906c130c31beafbe2773ca1 100644
--- a/third_party/WebKit/Source/core/layout/LayoutTableSection.h
+++ b/third_party/WebKit/Source/core/layout/LayoutTableSection.h
@@ -295,7 +295,7 @@ class CORE_EXPORT LayoutTableSection final : public LayoutTableBoxComponent {
       TransformState&,
       VisualRectFlags = kDefaultVisualRectFlags) const override;
 
-  bool IsRepeatingHeaderGroup() const;
+  bool IsRepeatingHeaderGroup() const { return is_repeating_header_group_; };
 
   void UpdateLayout() override;
 
@@ -304,6 +304,10 @@ class CORE_EXPORT LayoutTableSection final : public LayoutTableBoxComponent {
     return CellSpan(0, Table()->NumEffectiveColumns());
   }
 
+  void SetHeaderGroupShouldRepeat() {

[mstensho (USE GERRIT), 2017/05/22 10:40:44]

DetermineIfHeaderGroupShouldRepeat()?

[rhogan, 2017/05/22 18:06:04]

Done.

+    is_repeating_header_group_ = HeaderGroupShouldRepeat();
+  }
+
  protected:
   void StyleDidChange(StyleDifference, const ComputedStyle* old_style) override;
   bool NodeAtPoint(HitTestResult&,
@@ -393,6 +397,8 @@ class CORE_EXPORT LayoutTableSection final : public LayoutTableBoxComponent {
 
   bool PaintedOutputOfObjectHasNoEffectRegardlessOfSize() const override;
 
+  bool HeaderGroupShouldRepeat() const;
+
   struct TableGridRow {
     DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
 
@@ -455,6 +461,9 @@ class CORE_EXPORT LayoutTableSection final : public LayoutTableBoxComponent {
 
   // Whether any cell spans multiple rows or cols.
   bool has_spanning_cells_;
+
+  // Header group should be painted on every page.
+  bool is_repeating_header_group_;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTableSection, IsTableSection());