Preparation for enabling slimming paint synchronized painting

third_party/WebKit/Source/platform/graphics/paint/PaintController.cpp

 // Copyright 2014 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 "config.h"
 #include "platform/graphics/paint/PaintController.h"
 
 #include "platform/NotImplemented.h"
 #include "platform/TraceEvent.h"
 #include "platform/graphics/GraphicsLayer.h"
@@ skipping 106 matching lines @@
     invalidateClient(client);
 
     if (visualRect) {
         // TODO(wkorman): cache visualRect for the client.
     }
 }
 
 void PaintController::invalidateClient(const DisplayItemClientWrapper& client)
 {
 #if ENABLE(ASSERT)
-    m_invalidations.append(client.debugName());
+    // Slimming paint v1 CompositedLayerMapping may invalidate client on extra layers.
+    if (RuntimeEnabledFeatures::slimmingPaintV2Enabled() || clientCacheIsValid(client.displayItemClient()))
+        m_invalidations.append(client.debugName());
 #endif
 
     invalidateUntracked(client.displayItemClient());
     if (RuntimeEnabledFeatures::slimmingPaintV2Enabled() && m_trackedPaintInvalidationObjects)
         m_trackedPaintInvalidationObjects->append(client.debugName());
 }
 
 void PaintController::invalidateUntracked(DisplayItemClient client)
 {
     // This can be called during painting, but we can't invalidate already painted clients.
@@ skipping 424 matching lines @@
 
 void PaintController::showDebugData() const
 {
     WTFLogAlways("current display item list: [%s]\n", displayItemListAsDebugString(m_currentPaintArtifact.displayItemList()).utf8().data());
     WTFLogAlways("new display item list: [%s]\n", displayItemListAsDebugString(m_newDisplayItemList).utf8().data());
 }
 
 #endif // ifndef NDEBUG
 
 } // namespace blink