Add paint testing mode subsequence_caching_disabled

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

 // Copyright 2015 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 "platform/graphics/paint/SubsequenceRecorder.h"
 
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/CachedDisplayItem.h"
 #include "platform/graphics/paint/PaintController.h"
 #include "platform/graphics/paint/SubsequenceDisplayItem.h"
 
 namespace blink {
 
 bool SubsequenceRecorder::useCachedSubsequenceIfPossible(GraphicsContext& context, const DisplayItemClient& client)
 {
     if (!RuntimeEnabledFeatures::slimmingPaintSynchronizedPaintingEnabled())
         return false;
 
-    if (context.paintController().displayItemConstructionIsDisabled())
+    if (context.paintController().displayItemConstructionIsDisabled() || context.paintController().subsequenceCachingIsDisabled())
         return false;
 
     if (!context.paintController().clientCacheIsValid(client))
         return false;
 
     context.paintController().createAndAppend<CachedDisplayItem>(client, DisplayItem::CachedSubsequence);
 
 #if ENABLE(ASSERT)
     // When under-invalidation checking is enabled, we output CachedSubsequence display item
     // followed by forced painting of the subsequence.
@@ skipping 34 matching lines @@
         if (m_paintController.newDisplayItemList().last().skippedCache()) {
             m_paintController.removeLastDisplayItem();
             return;
         }
     }
 
     m_paintController.createAndAppend<EndSubsequenceDisplayItem>(m_client);
 }
 
 } // namespace blink