Add WSI functions to GrVkInterface

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
 
 #include "GrGpu.h"
 #include "GrGpuFactory.h"
 #include "vk/GrVkBackendContext.h"
 #include "GrVkCaps.h"
 #include "GrVkIndexBuffer.h"
 #include "GrVkResourceProvider.h"
 #include "GrVkVertexBuffer.h"
 #include "GrVkUtil.h"
 
 #include "shaderc/shaderc.h"
-#include "vulkan/vulkan.h"
+#include "vk/GrVkDefines.h"
 
 class GrPipeline;
 class GrNonInstancedMesh;
 
 class GrVkBufferImpl;
 class GrVkCommandBuffer;
 class GrVkPipeline;
 class GrVkPipelineState;
 class GrVkRenderPass;
 class GrVkTexture;
@@ skipping 183 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