Implement a paint offset cache for slimming paint v2

Source/platform/graphics/paint/DrawingRecorder.cpp

Index: Source/platform/graphics/paint/DrawingRecorder.cpp
diff --git a/Source/platform/graphics/paint/DrawingRecorder.cpp b/Source/platform/graphics/paint/DrawingRecorder.cpp
index d24abbc264209f9c7aa4e70be8aa6e6a826365d8..3d9887588f8b162107d3bd085ed33ba00d1c0eb2 100644
--- a/Source/platform/graphics/paint/DrawingRecorder.cpp
+++ b/Source/platform/graphics/paint/DrawingRecorder.cpp
@@ -49,7 +49,8 @@ DrawingRecorder::DrawingRecorder(GraphicsContext& context, const DisplayItemClie
         return;
 
     // Must check DrawingRecorder::useCachedDrawingIfPossible before creating the DrawingRecorder.
-    ASSERT(!useCachedDrawingIfPossible(m_context, m_displayItemClient, m_displayItemType));
+    ASSERT((RuntimeEnabledFeatures::slimmingPaintV2Enabled() && context.displayItemList()->paintOffsetWasInvalidated(displayItemClient.displayItemClient()))
+        || !useCachedDrawingIfPossible(m_context, m_displayItemClient, m_displayItemType));
 
     ASSERT(DisplayItem::isDrawingType(displayItemType));