Add vulkan files into skia repo.

src/gpu/vk/GrVkTransferBuffer.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 GrVkTransferBuffer_DEFINED
+#define GrVkTransferBuffer_DEFINED
+
+#include "GrTransferBuffer.h"
+#include "GrVkBuffer.h"
+#include "vk/GrVkInterface.h"
+
+class GrVkGpu;
+
+class GrVkTransferBuffer : public GrTransferBuffer, public GrVkBuffer {
+
+public:
+    static GrVkTransferBuffer* Create(GrVkGpu* gpu, size_t size, GrVkBuffer::Type type);
+
+protected:
+    void onAbandon() override;
+    void onRelease() override;
+
+private:
+    GrVkTransferBuffer(GrVkGpu* gpu, const GrVkBuffer::Desc& desc,
+                       const GrVkBuffer::Resource* resource);
+    void setMemoryBacking(SkTraceMemoryDump* traceMemoryDump,
+                          const SkString& dumpName) const override;
+
+    void* onMap() override {
+        if (!this->wasDestroyed()) {
+            return this->vkMap(this->getVkGpu());
+        } else {
+            return nullptr;
+        }
+    }
+
+    void onUnmap() override {
+        if (!this->wasDestroyed()) {
+            this->vkUnmap(this->getVkGpu());
+        }
+    }
+
+    GrVkGpu* getVkGpu() const {
+        SkASSERT(!this->wasDestroyed());
+        return reinterpret_cast<GrVkGpu*>(this->getGpu());
+    }
+
+    typedef GrTransferBuffer INHERITED;
+};
+
+#endif