Add static buffer support

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 107 matching lines @@
     void submitSecondaryCommandBuffer(const GrVkSecondaryCommandBuffer*,
                                       const GrVkRenderPass*,
                                       const VkClearValue*,
                                       GrVkRenderTarget*,
                                       const SkIRect& bounds);
 
     void finishDrawTarget() override;
 
     void generateMipmap(GrVkTexture* tex) const;
 
+    bool updateBuffer(GrVkBuffer* buffer, const void* src, size_t srcSizeInBytes);
+
     // Heaps
     enum Heap {
         kLinearImage_Heap = 0,
         // We separate out small (i.e., <= 16K) images to reduce fragmentation
         // in the main heap.
         kOptimalImage_Heap,
         kSmallOptimalImage_Heap,
         // We have separate vertex and image heaps, because it's possible that 
         // a given Vulkan driver may allocate them separately.
         kVertexBuffer_Heap,
@@ skipping 104 matching lines @@
 
     // 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;
 
 
     typedef GrGpu INHERITED;
 };
 
 #endif