[No submit][SPInvalidation] Track paint offset change

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

Index: third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
index 7809718197662d42c7d098da2a81de3594935373..d618961420c67b613eecb2a7c3aa07c49fbf4cae 100644
--- a/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintPropertyTreeBuilder.cpp
@@ -226,6 +226,7 @@ void PaintPropertyTreeBuilder::updatePaintOffsetTranslation(
 
   const auto* properties = object.paintProperties();
   if (properties && properties->paintOffsetTranslation()) {
+    LOG(ERROR) << object.debugName() << " created paintOffsetTranslation";
     context.current.transform = properties->paintOffsetTranslation();
     context.current.paintOffset = fractionalPaintOffset;
     if (RuntimeEnabledFeatures::rootLayerScrollingEnabled() &&
@@ -236,6 +237,9 @@ void PaintPropertyTreeBuilder::updatePaintOffsetTranslation(
       context.fixedPosition.paintOffset = LayoutPoint();
     }
   }
+
+  LOG(ERROR) << object.debugName()
+             << " paintOffset:" << context.current.paintOffset.toString();
 }
 
 static FloatPoint3D transformOrigin(const LayoutBox& box) {
@@ -666,6 +670,8 @@ void PaintPropertyTreeBuilder::updateOutOfFlowContext(
   if (object.canContainAbsolutePositionObjects()) {
     context.absolutePosition = context.current;
     context.containerForAbsolutePosition = &object;
+    LOG(ERROR) << object.debugName() << " canContainAbsolute: paintOffset="
+               << context.absolutePosition.paintOffset.toString();
   }
 
   if (object.isLayoutView()) {
@@ -821,8 +827,12 @@ static void deriveBorderBoxFromContainerContext(
     // calculate containers (e.g., topLeftLocation, offsetForInFlowPosition*).
     // The containing block and other containers can be stored on
     // PaintPropertyTreeBuilderContext instead of recomputing them.
+    LOG(ERROR) << object.debugName() << " before offset paintOffset="
+               << context.current.paintOffset.toString();
     context.current.paintOffset.moveBy(
         toLayoutBox(boxModelObject).topLeftLocation());
+    LOG(ERROR) << object.debugName() << " add offset paintOffset="
+               << context.current.paintOffset.toString();
     // This is a weird quirk that table cells paint as children of table rows,
     // but their location have the row's location baked-in.
     // Similar adjustment is done in LayoutTableCell::offsetFromContainer().