Don't create new descriptor set for vulkan uniforms every draw

src/gpu/vk/GrVkUniformBuffer.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 GrVkUniformBuffer_DEFINED
 #define GrVkUniformBuffer_DEFINED
 
 #include "GrVkBuffer.h"
 
 class GrVkGpu;
 
 class GrVkUniformBuffer : public GrVkBuffer {
 
 public:
     static GrVkUniformBuffer* Create(GrVkGpu* gpu, size_t size, bool dynamic);
 
     void* map(const GrVkGpu* gpu) {
         return this->vkMap(gpu);
     }
     void unmap(const GrVkGpu* gpu) {
         this->vkUnmap(gpu);
     }
-    bool updateData(const GrVkGpu* gpu, const void* src, size_t srcSizeInBytes) {
-        return this->vkUpdateData(gpu, src, srcSizeInBytes);
+    // The output variable createdNewBuffer must be set to true if a new VkBuffer is created in
+    // order to upload the data
+    bool updateData(const GrVkGpu* gpu, const void* src, size_t srcSizeInBytes,
+                    bool* createdNewBuffer) {
+        return this->vkUpdateData(gpu, src, srcSizeInBytes, createdNewBuffer);
     }
     void release(const GrVkGpu* gpu) {
         this->vkRelease(gpu);
     }
     void abandon() {
         this->vkAbandon();
     }
 
 private:
     GrVkUniformBuffer(const GrVkBuffer::Desc& desc, const GrVkBuffer::Resource* resource)
         : INHERITED(desc, resource) {
     };
 
     typedef GrVkBuffer INHERITED;
 };
 
 #endif