Move and rename RenderPart to LayoutPart.

Source/core/layout/compositing/CompositingLayerAssigner.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 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 112 matching lines @@
     // Video does not currently support sharing a backing, but this could be
     // generalized in the future. The following layout tests fail if we permit the
     // video to share a backing with other layers.
     //
     // compositing/video/video-controls-layer-creation.html
     if (layer->renderer()->isVideo() || squashingLayer.renderer()->isVideo())
         return CompositingReasonSquashingVideoIsDisallowed;
 
     // Don't squash iframes, frames or plugins.
     // FIXME: this is only necessary because there is frame code that assumes that composited frames are not squashed.
-    if (layer->renderer()->isRenderPart() || squashingLayer.renderer()->isRenderPart())
-        return CompositingReasonSquashingRenderPartIsDisallowed;
+    if (layer->renderer()->isLayoutPart() || squashingLayer.renderer()->isLayoutPart())
+        return CompositingReasonSquashingLayoutPartIsDisallowed;
 
     if (layer->reflectionInfo())
         return CompositingReasonSquashingReflectionIsDisallowed;
 
     if (squashingWouldExceedSparsityTolerance(layer, squashingState))
         return CompositingReasonSquashingSparsityExceeded;
 
     if (layer->renderer()->style()->hasBlendMode())
         return CompositingReasonSquashingBlendingIsDisallowed;
 
@@ skipping 135 matching lines @@
 
     LayerStackingNodeIterator iterator(*layer->stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
     while (LayerStackingNode* curNode = iterator.next())
         assignLayersToBackingsInternal(curNode->layer(), squashingState, layersNeedingPaintInvalidation);
 
     if (squashingState.hasMostRecentMapping && &squashingState.mostRecentMapping->owningLayer() == layer)
         squashingState.haveAssignedBackingsToEntireSquashingLayerSubtree = true;
 }
 
 }