[No submit][SPInvalidation] Track paint offset change

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

Index: third_party/WebKit/Source/core/paint/PaintInvalidator.h
diff --git a/third_party/WebKit/Source/core/paint/PaintInvalidator.h b/third_party/WebKit/Source/core/paint/PaintInvalidator.h
index 7813bdb83e2c72849a4ecd4420f15412f1f795c9..dea766bb8bf8c414e28d73b94841396c7a8624f8 100644
--- a/third_party/WebKit/Source/core/paint/PaintInvalidator.h
+++ b/third_party/WebKit/Source/core/paint/PaintInvalidator.h
@@ -31,7 +31,12 @@ struct PaintInvalidatorContext {
         paintInvalidationContainer(parentContext.paintInvalidationContainer),
         paintInvalidationContainerForStackedContents(
             parentContext.paintInvalidationContainerForStackedContents),
-        paintingLayer(parentContext.paintingLayer) {}
+        paintingLayer(parentContext.paintingLayer),
+        shouldAdjustPaintOffsetToContainer(
+            parentContext.shouldAdjustPaintOffsetToContainer),
+        shouldAdjustPaintOffsetToContainerForStackedContents(
+            parentContext
+                .shouldAdjustPaintOffsetToContainerForStackedContents) {}
 
   // This method is temporary to adapt PaintInvalidatorContext and the legacy
   // PaintInvalidationState for code shared by old code and new code.
@@ -69,7 +74,7 @@ struct PaintInvalidatorContext {
 
   PaintLayer* paintingLayer = nullptr;
 
-  // Store the new and old visual rects in the paint invalidation backing's
+  // Store the old and new visual rects in the paint invalidation backing's
   // coordinates. The rects do *not* account for composited scrolling.
   // See LayoutObject::adjustVisualRectForCompositedScrolling().
   LayoutRect oldVisualRect;
@@ -82,6 +87,17 @@ struct PaintInvalidatorContext {
   // LayoutObject::adjustVisualRectForCompositedScrolling().
   LayoutPoint oldLocation;
   LayoutPoint newLocation;
+
+  // Stores the old and new offsets to paint this object, relative to the
+  // containing transform node.
+  LayoutPoint oldPaintOffset;
+  LayoutPoint newPaintOffset;
+
+  // PaintPropertyTreeBuilder computes paint offset relative to the containing
+  // transform node. If the transform node is above paintInvalidationContainer,
+  // we need to adjust paint offset into paintInvalidationContainer space.
+  bool shouldAdjustPaintOffsetToContainer = false;
+  bool shouldAdjustPaintOffsetToContainerForStackedContents = false;
 };
 
 class PaintInvalidator {