Add check for missing visual rect updates and fix failures

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

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/paint/PaintInvalidator.h"
 
 #include "core/editing/FrameSelection.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
@@ skipping 151 matching lines @@
     return mapLocalRectToPaintInvalidationBacking<FloatRect, FloatPoint>(
         object, localRect, context, m_geometryMapper);
   }
   return mapLocalRectToPaintInvalidationBacking<LayoutRect, LayoutPoint>(
       object, object.localVisualRect(), context, m_geometryMapper);
 }
 
 LayoutPoint PaintInvalidator::computeLocationInBacking(
     const LayoutObject& object,
     const PaintInvalidatorContext& context) {
+  // In SPv2, locationInBacking is in the space of their local transform node.
+  if (RuntimeEnabledFeatures::slimmingPaintV2Enabled())
+    return object.paintOffset();
+
   LayoutPoint point;
   if (object != context.paintInvalidationContainer) {
     point.moveBy(object.paintOffset());
 
     const auto* containerTransform =
         context.paintInvalidationContainer->paintProperties()
             ->contentsProperties()
             ->transform();
     if (context.treeBuilderContext.current.transform != containerTransform) {
       point = LayoutPoint(m_geometryMapper
@@ skipping 236 matching lines @@
   if (object.document().printing() &&
       !RuntimeEnabledFeatures::printBrowserEnabled())
     return;  // Don't invalidate paints if we're printing.
 
   updatePaintInvalidationContainer(object, context);
 
   bool objectShouldCheckForPaintInvalidation =
       object
           .shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
   if (!context.forcedSubtreeInvalidationFlags &&
-      !objectShouldCheckForPaintInvalidation)
+      !objectShouldCheckForPaintInvalidation) {
+#if DCHECK_IS_ON()
+    updateVisualRect(object, context);
+    DCHECK(enclosingIntRect(context.oldVisualRect) ==
+           enclosingIntRect(context.newVisualRect))
+        << "Visual rect changed without needing paint invalidation:"
+        << " old=" << context.oldVisualRect.toString()
+        << " new=" << context.newVisualRect.toString();
+    DCHECK(context.oldLocation == context.newLocation)
+        << "Location changed without needing paint invalidation:"
+        << " old=" << context.oldLocation.toString()
+        << " new=" << context.newLocation.toString();
+#endif
     return;
+  }
 
   updateVisualRect(object, context);
 
   if (!objectShouldCheckForPaintInvalidation &&
       context.forcedSubtreeInvalidationFlags ==
           PaintInvalidatorContext::ForcedSubtreeInvalidationRectUpdate) {
     // We are done updating the visual rect. No other paint invalidation work to
     // do for this object.
     return;
   }
@@ skipping 28 matching lines @@
   }
 }
 
 void PaintInvalidator::processPendingDelayedPaintInvalidations() {
   for (auto target : m_pendingDelayedPaintInvalidations)
     target->getMutableForPainting().setShouldDoFullPaintInvalidation(
         PaintInvalidationDelayedFull);
 }
 
 }  // namespace blink