Use VkPipelineCaches during VkPipeline creation

src/gpu/vk/GrVkResourceProvider.h

 /*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
 #ifndef GrVkResourceProvider_DEFINED
 #define GrVkResourceProvider_DEFINED
 
@@ skipping 10 matching lines @@
 class GrVkGpu;
 class GrVkPipeline;
 class GrVkRenderPass;
 class GrVkRenderTarget;
 
 class GrVkResourceProvider {
 public:
     GrVkResourceProvider(GrVkGpu* gpu);
     ~GrVkResourceProvider();
 
+    // Set up any initial vk objects
+    void init();
+
     GrVkPipeline* createPipeline(const GrPipeline& pipeline,
                                  const GrPrimitiveProcessor& primProc,
                                  VkPipelineShaderStageCreateInfo* shaderStageInfo,
                                  int shaderStageCount,
                                  GrPrimitiveType primitiveType,
                                  const GrVkRenderPass& renderPass,
                                  VkPipelineLayout layout);
 
     // Finds or creates a simple render pass that matches the target, increments the refcount,
     // and returns.
@@ skipping 18 matching lines @@
     void destroyResources();
 
     // Abandon any cached resources. To be used when the context/VkDevice is lost.
     // For resource tracing to work properly, this should be called after unrefing all other
     // resource usages.
     void abandonResources();
 
 private:
     GrVkGpu* fGpu;
 
+    // Central cache for creating pipelines
+    VkPipelineCache fPipelineCache;
+
     // Array of RenderPasses that only have a single color attachment, optional stencil attachment,
     // optional resolve attachment, and only one subpass
     SkSTArray<4, GrVkRenderPass*> fSimpleRenderPasses;
 
     // Array of CommandBuffers that are currently in flight
     SkSTArray<4, GrVkCommandBuffer*> fActiveCommandBuffers;
 };
 
 #endif