Add fence support for TransferBuffers

src/gpu/vk/GrVkGpu.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrVkGpu_DEFINED
 #define GrVkGpu_DEFINED
 
@@ skipping 123 matching lines @@
     void onResolveRenderTarget(GrRenderTarget* target) override;
 
     void submitSecondaryCommandBuffer(GrVkSecondaryCommandBuffer*,
                                       const GrVkRenderPass*,
                                       const VkClearValue*,
                                       GrVkRenderTarget*,
                                       const SkIRect& bounds);
 
     void finishDrawTarget() override;
 
+    GrFence SK_WARN_UNUSED_RESULT insertFence() const override;
+    bool waitFence(GrFence, uint64_t timeout) const override;
+    void deleteFence(GrFence) const override;
+
     void generateMipmap(GrVkTexture* tex);
 
     bool updateBuffer(GrVkBuffer* buffer, const void* src, VkDeviceSize offset, VkDeviceSize size);
 
     // Heaps
     enum Heap {
         kLinearImage_Heap = 0,
         // We separate out small (i.e., <= 16K) images to reduce fragmentation
         // in the main heap.
         kOptimalImage_Heap,
@@ skipping 123 matching lines @@
 #else
     // Shaderc compiler used for compiling glsl in spirv. We only want to create the compiler once
     // since there is significant overhead to the first compile of any compiler.
     shaderc_compiler_t fCompiler;
 #endif
 
     typedef GrGpu INHERITED;
 };
 
 #endif