Change VkPipelineStateCahce to use Hash and LRU LList.

src/gpu/vk/GrVkGpu.h

Index: src/gpu/vk/GrVkGpu.h
diff --git a/src/gpu/vk/GrVkGpu.h b/src/gpu/vk/GrVkGpu.h
index 0e94b11a1f1714802647ca8930dbf3d9b829b90d..f9984d7ea8f70d973dd02d371c7c77299d7bea35 100644
--- a/src/gpu/vk/GrVkGpu.h
+++ b/src/gpu/vk/GrVkGpu.h
@@ -160,11 +160,10 @@ private:
 
     void onResolveRenderTarget(GrRenderTarget* target) override {}
 
-    bool prepareDrawState(const GrPipeline&,
-                          const GrPrimitiveProcessor&,
-                          GrPrimitiveType,
-                          const GrVkRenderPass&,
-                          GrVkPipelineState** pipelineState);
+    sk_sp<GrVkPipelineState> prepareDrawState(const GrPipeline&,
+                                              const GrPrimitiveProcessor&,
+                                              GrPrimitiveType,
+                                              const GrVkRenderPass&);
 
     // Bind vertex and index buffers
     void bindGeometry(const GrPrimitiveProcessor&, const GrNonInstancedMesh&);