Suppress layer creation for descendants of GPU-rasterized layers

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index c75eeed13d3c4a2602cfca85c7476431156d6428..c35740c35264f76b4298c9f530c43c72472312f3 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -230,6 +230,9 @@ RenderBlock::~RenderBlock()
 
 void RenderBlock::willBeDestroyed()
 {
+    // Hits in compositing/squashing/squash-onto-nephew.html.
+    DisableCompositingQueryAsserts disabler;

[abarth-chromium, 2014/04/17 17:29:51]

Where is the access to composited state?  I don't see it here.

[ajuma, 2014/04/17 19:24:44]

It's actually in ~CompositedLayerMapping(). I've moved the disabler there.

+
     // Mark as being destroyed to avoid trouble with merges in removeChild().
     m_beingDestroyed = true;