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Fix crash with composited layers - DO NOT MERGE
Cherry-pick from master When we have composited layers inside iframes/frames, the layers hierarchy is not always up to date at the time of the layerSync() call. If some of those layers are scheduled to be repainted, the repaint operation will triggers the update of the composited layers tree -- possibly resulting in the deallocation of the very same GraphicsLayer we were painting from, and thus leading to a crash. The fix consist in gathering all the root RenderLayer (for each frame containing composited layers) and explicitely asking RenderLayerCompositor to check if the composited tree needs to be updated, before we traverse the tree to paint the elements. bug:5695185 Change-Id: I33a00b847eb19c9aa4b68f0ac3adbe36709ed00b
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