Add paint testing mode subsequence_caching_disabled

third_party/WebKit/Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 312 matching lines @@
     if (firstPaintInvalidationTrackingEnabled())
         m_debugInfo.clearAnnotatedInvalidateRects();
     incrementPaintCount();
 
     IntRect newInterestRect;
     if (!interestRect) {
         newInterestRect = m_client->computeInterestRect(this, m_previousInterestRect);
         interestRect = &newInterestRect;
     }
 
-    if (!m_client->needsRepaint() && !paintController().cacheIsEmpty() && m_previousInterestRect == *interestRect) {
+    if (!paintController().subsequenceCachingIsDisabled()
+        && !m_client->needsRepaint()
+        && !paintController().cacheIsEmpty()
+        && m_previousInterestRect == *interestRect) {
         ASSERT(!paintController().hasInvalidations());
         return false;
     }
 
     GraphicsContext context(paintController(), disabledMode);
 
 #ifndef NDEBUG
     if (contentsOpaque() && s_drawDebugRedFill) {
         FloatRect rect(FloatPoint(), size());
         if (!DrawingRecorder::useCachedDrawingIfPossible(context, *this, DisplayItem::DebugRedFill)) {
@@ skipping 911 matching lines @@
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif