[SPInvalidation, SPv2] Compute paint offset for paginated content

third_party/WebKit/Source/core/paint/PaintInvalidator.cpp

Index: third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
index a093214a08042650d511df00983008f1384d1dde..6115c5ab3a701f93599f5868b4bce469961cad32 100644
--- a/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidator.cpp
@@ -443,7 +443,7 @@ void PaintInvalidator::InvalidatePaintIfNeeded(
 
   // TODO(crbug.com/637313): Use GeometryMapper which now supports filter
   // geometry effects, after skia optimizes filter's mapRect operation.
-  // TODO(crbug.com/648274): This is a workaround for multi-column contents.
+  // Multi-column requires the slow path. See crbug.com/648274).
   if (object.HasFilterInducingProperty() || object.IsLayoutFlowThread()) {
     context.forced_subtree_invalidation_flags |=
         PaintInvalidatorContext::kForcedSubtreeSlowPathRect;