[cc] Color evicted vs. invalidated checkerboard tiles differently

cc/TiledLayerChromium.cpp

 // Copyright 2011 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"
 
 #if USE(ACCELERATED_COMPOSITING)
 
 #include "TiledLayerChromium.h"
 
@@ skipping 197 matching lines @@
         int j = iter->key.second;
         UpdatableTile* tile = static_cast<UpdatableTile*>(iter->value.get());
 #else
         int i = iter->first.first;
         int j = iter->first.second;
         UpdatableTile* tile = static_cast<UpdatableTile*>(iter->second.get());
 #endif
         // FIXME: This should not ever be null.
         if (!tile)
             continue;
+
         tile->isInUseOnImpl = false;
+
         if (!tile->managedTexture()->haveBackingTexture()) {
+            // Evicted tiles get deleted from both layers
             invalidTiles.append(tile);
             continue;
         }
-        if (!tile->validForFrame)
+
+        if (!tile->validForFrame) {
+            // Invalidated tiles are set so they can get different debug colors.
+            tiledLayer->pushInvalidTile(i, j);
             continue;
+        }
 
         tiledLayer->pushTileProperties(i, j, tile->managedTexture()->resourceId(), tile->opaqueRect());
         tile->isInUseOnImpl = true;
     }
     for (Vector<UpdatableTile*>::const_iterator iter = invalidTiles.begin(); iter != invalidTiles.end(); ++iter)
         m_tiler->takeTile((*iter)->i(), (*iter)->j());
 }
 
 CCPrioritizedTextureManager* TiledLayerChromium::textureManager() const
 {
@@ skipping 567 matching lines @@
     prepaintRect.inflateX(m_tiler->tileSize().width());
     prepaintRect.inflateY(m_tiler->tileSize().height() * 2);
     IntRect contentRect(IntPoint::zero(), contentBounds());
     prepaintRect.intersect(contentRect);
 
     return prepaintRect;
 }
 
 }
 #endif // USE(ACCELERATED_COMPOSITING)