Add vulkan files into skia repo.

src/gpu/vk/GrVkDescriptorPool.h

+/*
+* Copyright 2016 Google Inc.
+*
+* Use of this source code is governed by a BSD-style license that can be
+* found in the LICENSE file.
+*/
+
+#ifndef GrVkDescriptorPool_DEFINED
+#define GrVkDescriptorPool_DEFINED
+
+#include "GrVkResource.h"
+
+#include "vulkan/vulkan.h"
+
+class GrVkGpu;
+
+class GrVkDescriptorPool : public GrVkResource {
+public:
+    class DescriptorTypeCounts {
+    public:
+        DescriptorTypeCounts() {
+            memset(fDescriptorTypeCount, 0, sizeof(fDescriptorTypeCount));
+        }
+
+        void setTypeCount(VkDescriptorType type, uint8_t count);
+        uint32_t numPoolSizes() const;
+
+        // Determines if for each i, that.fDescriptorTypeCount[i] <= fDescriptorTypeCount[i];
+        bool isSuperSet(const DescriptorTypeCounts& that) const;
+    private:
+        uint8_t fDescriptorTypeCount[VK_DESCRIPTOR_TYPE_RANGE_SIZE];
+
+        friend class GrVkDescriptorPool;
+    };
+
+    explicit GrVkDescriptorPool(const GrVkGpu* gpu, const DescriptorTypeCounts& typeCounts);
+
+    VkDescriptorPool descPool() const { return fDescPool; }
+
+    void reset(const GrVkGpu* gpu);
+
+    // Returns whether or not this descriptor pool could be used, assuming it gets fully reset and
+    // not in use by another draw, to support the requested typeCounts.
+    bool isCompatible(const DescriptorTypeCounts& typeCounts) const;
+
+private:
+    void freeGPUData(const GrVkGpu* gpu) const override;
+
+    DescriptorTypeCounts fTypeCounts;
+    VkDescriptorPool     fDescPool;
+
+    typedef GrVkResource INHERITED;
+};
+
+
+#endif