Walk render tree instead of render layers for paint.

sky/engine/core/frame/FrameView.cpp

Index: sky/engine/core/frame/FrameView.cpp
diff --git a/sky/engine/core/frame/FrameView.cpp b/sky/engine/core/frame/FrameView.cpp
index 7798affa2997c99efe6de51ac016c4fb159dd0b3..13efb7d915225b756414fa1b42197ed23d780df9 100644
--- a/sky/engine/core/frame/FrameView.cpp
+++ b/sky/engine/core/frame/FrameView.cpp
@@ -683,7 +683,8 @@ void FrameView::paint(GraphicsContext* context, const IntRect& rect)
     RenderObject::SetLayoutNeededForbiddenScope forbidSetNeedsLayout(*rootLayer->renderer());
 #endif
 
-    rootLayer->paint(context, rect);
+    // TODO(ojan): Is this rect passed down correct or even needed?
+    renderView->paintLayer(context, rootLayer, pixelSnappedIntRect(renderView->viewRect()));
 
     m_isPainting = false;
     m_lastPaintTime = currentTime();