Suppress layer creation for descendants of GPU-rasterized layers

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index 682d362e3eaca25fc7643a200c548fe0ecc86c8e..22584faefc0b1f976f2e6dafe0f2a48a20909b17 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -1165,12 +1165,14 @@ void RenderLayerCompositor::updateRootLayerPosition()
 void RenderLayerCompositor::updateStyleDeterminedCompositingReasons(RenderLayer* layer)
 {
     CompositingReasons reasons = m_compositingReasonFinder.styleDeterminedReasons(layer->renderer());
-    layer->setCompositingReasons(reasons, CompositingReasonComboAllStyleDeterminedReasons);

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

Yeah, I'm pretty sure you can drop the mask argument now.

+    layer->setStyleDeterminedCompositingReasons(reasons);
 }
 
 void RenderLayerCompositor::updateDirectCompositingReasons(RenderLayer* layer)
 {
     CompositingReasons reasons = m_compositingReasonFinder.directReasons(layer, &m_needsToRecomputeCompositingRequirements);
+    if (layer->suppressingCompositedLayerCreation())
+        reasons = m_compositingReasonFinder.suppressWillChangeAndAnimationForGpuRasterization(layer, reasons);
     layer->setCompositingReasons(reasons, CompositingReasonComboAllDirectReasons);
 }