Move Layer creation/deletion into the RenderPipeline.

Test: refactoring. existing tests still pass.
Change-Id: I032c33896a0cb74c91e2a913a584373518466b88
diff --git a/libs/hwui/renderthread/OpenGLPipeline.h b/libs/hwui/renderthread/OpenGLPipeline.h
index e08fd9b..34d9bc0 100644
--- a/libs/hwui/renderthread/OpenGLPipeline.h
+++ b/libs/hwui/renderthread/OpenGLPipeline.h
@@ -56,6 +56,9 @@
             LayerUpdateQueue* layerUpdateQueue, bool opaque,
             const BakedOpRenderer::LightInfo& lightInfo) override;
     TaskManager* getTaskManager() override;
+    bool createOrUpdateLayer(RenderNode* node,
+            const DamageAccumulator& damageAccumulator) override;
+    static void destroyLayer(RenderNode* node);
 
 private:
     EglManager& mEglManager;