Merge 94964 - [chromium] REGRESSION(94353): Compositor textures and resources leaked when tab clo...

Source/WebCore/platform/graphics/chromium/TiledLayerChromium.cpp

 /*
  * Copyright (C) 2011 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:
  *
  * 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
@@ skipping 120 matching lines @@
     if (m_tilingOption == NeverTile && m_tiler->numTiles() > 1)
         return false;
 
     return !m_skipsDraw;
 }
 
 void TiledLayerChromium::setLayerTreeHost(CCLayerTreeHost* host)
 {
     LayerChromium::setLayerTreeHost(host);
 
-    if (m_tiler)
+    if (m_tiler || !host)
         return;
 
     createTextureUpdater(host);
 
     m_textureFormat = host->layerRendererCapabilities().bestTextureFormat;
     m_textureOrientation = textureUpdater()->orientation();
     m_sampledTexelFormat = textureUpdater()->sampledTexelFormat(m_textureFormat);
     m_tiler = CCLayerTilingData::create(
         IntSize(defaultTileSize, defaultTileSize),
         isRootLayer() ? CCLayerTilingData::NoBorderTexels : CCLayerTilingData::HasBorderTexels);
@@ skipping 274 matching lines @@
 
     m_paintRect = m_tiler->layerRectToContentRect(dirtyLayerRect);
     if (dirtyLayerRect.isEmpty())
         return;
 
     textureUpdater()->prepareToUpdate(m_paintRect, m_tiler->tileSize(), m_tiler->hasBorderTexels());
 }
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)