Add vulkan files into skia repo.

src/gpu/vk/GrVkIndexBuffer.h

Index: src/gpu/vk/GrVkIndexBuffer.h
diff --git a/src/gpu/vk/GrVkIndexBuffer.h b/src/gpu/vk/GrVkIndexBuffer.h
new file mode 100644
index 0000000000000000000000000000000000000000..84bbbd3377372185f3498abb92b4b71db3f99fc0
--- /dev/null
+++ b/src/gpu/vk/GrVkIndexBuffer.h
@@ -0,0 +1,39 @@
+/*
+ * 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 GrVkIndexBuffer_DEFINED
+#define GrVkIndexBuffer_DEFINED
+
+#include "GrIndexBuffer.h"
+#include "GrVkBuffer.h"
+#include "vk/GrVkInterface.h"
+
+class GrVkGpu;
+
+class GrVkIndexBuffer : public GrIndexBuffer, public GrVkBuffer {
+
+public:
+    static GrVkIndexBuffer* Create(GrVkGpu* gpu, size_t size, bool dynamic);
+
+protected:
+    void onAbandon() override;
+    void onRelease() override;
+
+private:
+    GrVkIndexBuffer(GrVkGpu* gpu, const GrVkBuffer::Desc& desc,
+                    const GrVkBuffer::Resource* resource);
+
+    void* onMap() override;
+    void onUnmap() override;
+    bool onUpdateData(const void* src, size_t srcSizeInBytes) override;
+
+    GrVkGpu* getVkGpu() const;
+
+    typedef GrIndexBuffer INHERITED;
+};
+
+#endif