Reland of Fragment blocks with non-visible overflow as normally when printing.

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

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index 0dd84a95a5ef36fce829705d9844611ab5a2c578..c326481f5ba15bd0db0e278de0f2c1eb54600961 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -4265,6 +4265,12 @@
     if ((isHorizontal && !scrollsOverflowY()) || (!isHorizontal && !scrollsOverflowX()))
         return false;
 
+    // Fragmenting scrollbars is only problematic in interactive media, e.g. multicol on a
+    // screen. If we're printing, which is non-interactive media, we should allow objects with
+    // non-visible overflow to be paginated as normally.
+    if (document().printing())
+        return false;
+
     // We do have overflow. We'll still be willing to paginate as long as the block
     // has auto logical height, auto or undefined max-logical-height and a zero or auto min-logical-height.
     // Note this is just a heuristic, and it's still possible to have overflow under these