Add vulkan files into skia repo.

src/gpu/vk/GrVkUniformBuffer.cpp

+/*
+* Copyright 2015 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#include "GrVkUniformBuffer.h"
+#include "GrVkGpu.h"
+
+
+GrVkUniformBuffer* GrVkUniformBuffer::Create(GrVkGpu* gpu, size_t size, bool dynamic) {
+    if (0 == size) {
+        return nullptr;
+    }
+    GrVkBuffer::Desc desc;
+    desc.fDynamic = dynamic;
+    desc.fType = GrVkBuffer::kUniform_Type;
+    desc.fSizeInBytes = size;
+
+    const GrVkBuffer::Resource* bufferResource = GrVkBuffer::Create(gpu, desc);
+    if (!bufferResource) {
+        return nullptr;
+    }
+
+    GrVkUniformBuffer* buffer = new GrVkUniformBuffer(desc, bufferResource);
+    if (!buffer) {
+        bufferResource->unref(gpu);
+    }
+    return buffer;
+}