WebKit Layers

1 document()->renderer(), it is renderview, the root of render tree.
2 Each render view has a renderlayercompositor
3 RenderModelObject has a renderlayer
4 RenderLayer <-> RenderBacking<->GraphicsLayer <-> … <-> LayerAndroid
5 RenderlayerCompositor, created with renderview, layers’ compositing is done via it.
Create layer,

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LayerAndroid

   external/webkit/Source/WebCore/platform/graphics/android/layers/LayerAndroid.cpp:99

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GraphicsLayerAndroid

   external/webkit/Source/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp:125

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 WebCore::GraphicsLayer::create(WebCore::GraphicsLayerClient*)

   external/webkit/Source/WebCore/platform/graphics/android/GraphicsLayerAndroid.cpp:96

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 WebCore::RenderLayerCompositor::ensureRootPlatformLayer()

   external/webkit/Source/WebCore/rendering/RenderLayerCompositor.cpp:1788

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 WebCore::RenderLayerCompositor::enableCompositingMode(bool)

   external/webkit/Source/WebCore/rendering/RenderLayerCompositor.cpp:153

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 WebCore::RenderLayerCompositor::updateBacking(WebCore::RenderLayer*, WebCore::RenderLayerCompositor::CompositingChangeRepaint)

  external/webkit/Source/WebCore/rendering/RenderLayerCompositor.cpp:360

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 WebCore::RenderLayerCompositor::updateLayerCompositingState(WebCore::RenderLayer*, WebCore::RenderLayerCompositor::CompositingChangeRepaint)

   external/webkit/Source/WebCore/rendering/RenderLayerCompositor.cpp:437

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 WebCore::RenderLayer::styleChanged(WebCore::StyleDifference, WebCore::RenderStyle const*)
   external/webkit/Source/WebCore/rendering/RenderLayer.cpp:4120

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 WebCore::RenderBoxModelObject::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)

   external/webkit/Source/WebCore/rendering/RenderBoxModelObject.cpp:363

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 WebCore::RenderBox::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)

   external/webkit/Source/WebCore/rendering/RenderBox.cpp:300

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 WebCore::RenderReplaced::styleDidChange(WebCore::StyleDifference, WebCore::RenderStyle const*)
   external/webkit/Source/WebCore/rendering/RenderReplaced.cpp:70

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 WebCore::RenderObject::setStyle(WTF::PassRefPtr<WebCore::RenderStyle>)
   external/webkit/Source/WebCore/rendering/RenderObject.cpp:1649

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 WebCore::RenderObject::setAnimatableStyle(WTF::PassRefPtr<WebCore::RenderStyle>)
   external/webkit/Source/WebCore/rendering/RenderObject.cpp:1566

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 WebCore::Node::createRendererAndStyle()
   external/webkit/Source/WebCore/dom/Node.cpp:1565

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 WebCore::Node::createRendererIfNeeded()
   external/webkit/Source/WebCore/dom/Node.cpp:1590

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 WebCore::Element::attach()
   external/webkit/Source/WebCore/dom/Element.cpp:1010