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Bug 1213120 - Ensure we don't try to use an uninitialized map. r=BenWa
--HG-- extra : commitid : KBCIVOZsVmU
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@ -1650,6 +1650,7 @@ CompositorParent::SetControllerForLayerTree(uint64_t aLayersId,
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/*static*/ APZCTreeManager*
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CompositorParent::GetAPZCTreeManager(uint64_t aLayersId)
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{
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EnsureLayerTreeMapReady();
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const CompositorParent::LayerTreeState* state = CompositorParent::GetIndirectShadowTree(aLayersId);
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if (state && state->mParent) {
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return state->mParent->mApzcTreeManager;
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