Paint collapsed borders of a table as one display item

third_party/WebKit/Source/platform/graphics/paint/CullRect.h

Index: third_party/WebKit/Source/platform/graphics/paint/CullRect.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/CullRect.h b/third_party/WebKit/Source/platform/graphics/paint/CullRect.h
index b3a706c8e160929b93a7b6e58159a5fcc4c7c437..1de99f830770ec608048d7edc38c262b28c493a0 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/CullRect.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/CullRect.h
@@ -27,6 +27,7 @@ class PLATFORM_EXPORT CullRect {
   DISALLOW_NEW();
 
  public:
+  CullRect() {}
   explicit CullRect(const IntRect& rect) : m_rect(rect) {}
   CullRect(const CullRect&, const IntPoint& offset);
   CullRect(const CullRect&, const IntSize& offset);
@@ -42,6 +43,8 @@ class PLATFORM_EXPORT CullRect {
  private:
   IntRect m_rect;
 
+  friend bool operator==(const CullRect&, const CullRect&);
+
   // TODO(chrishtr): temporary while we implement CullRect everywhere.
   friend class FramePainter;
   friend class GridPainter;
@@ -54,6 +57,13 @@ class PLATFORM_EXPORT CullRect {
   friend class WebPluginContainerImpl;
 };
 
+inline bool operator==(const CullRect& a, const CullRect& b) {
+  return a.m_rect == b.m_rect;
+}
+inline bool operator!=(const CullRect& a, const CullRect& b) {
+  return !(a == b);
+}
+
 }  // namespace blink
 
 #endif  // CullRect_h