(WIP) Invalidation during painting (for synchronized painting)

third_party/WebKit/Source/core/dom/DocumentLifecycle.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 179 matching lines @@
         break;
     case InCompositingUpdate:
         return nextState == CompositingClean;
     case CompositingClean:
         if (nextState == InStyleRecalc)
             return true;
         if (nextState == InPreLayout)
             return true;
         if (nextState == InCompositingUpdate)
             return true;
-        if (nextState == InPaintInvalidation)
-            return true;
-        break;
-    case InPaintInvalidation:
-        return nextState == PaintInvalidationClean;
-    case PaintInvalidationClean:
-        if (nextState == InStyleRecalc)
-            return true;
-        if (nextState == InPreLayout)
-            return true;
-        if (nextState == InCompositingUpdate)
+        if (nextState == InPaintInvalidation && !RuntimeEnabledFeatures::slimmingPaintV2Enabled())
             return true;
         if (RuntimeEnabledFeatures::slimmingPaintV2Enabled()) {
             if (nextState == InUpdatePaintProperties)
                 return true;
         } else if (nextState == InPaint) {
             return true;
         }
         break;
+    case InPaintInvalidation:
+        ASSERT(!RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+        return nextState == PaintInvalidationClean;
+    case PaintInvalidationClean:
+        ASSERT(!RuntimeEnabledFeatures::slimmingPaintV2Enabled());
+        if (nextState == InStyleRecalc)
+            return true;
+        if (nextState == InPreLayout)
+            return true;
+        if (nextState == InCompositingUpdate)
+            return true;
+        if (nextState == InPaint)
+            return true;
+        break;
     case InUpdatePaintProperties:
         if (nextState == UpdatePaintPropertiesClean && RuntimeEnabledFeatures::slimmingPaintV2Enabled())
             return true;
         break;
     case UpdatePaintPropertiesClean:
         if (nextState == InPaint && RuntimeEnabledFeatures::slimmingPaintV2Enabled())
             return true;
         break;
     case InPaint:
         if (nextState == PaintClean)
@@ skipping 87 matching lines @@
         DEBUG_STRING_CASE(Stopped);
         DEBUG_STRING_CASE(Disposed);
     }
 
     ASSERT_NOT_REACHED();
     return "Unknown";
 }
 #endif
 
 } // namespace blink