Added initial implementation of the Vulkan Context Provider.

gpu/vulkan/vulkan_command_pool.h

 // Copyright (c) 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef GPU_VULKAN_VULKAN_COMMAND_POOL_H_
 #define GPU_VULKAN_VULKAN_COMMAND_POOL_H_
 
 #include <vulkan/vulkan.h>
 
 #include "base/macros.h"
 #include "base/memory/scoped_ptr.h"
 
 namespace gpu {
 
 class VulkanCommandBuffer;
+class VulkanDeviceQueue;
 
 class VulkanCommandPool {
  public:
-  VulkanCommandPool(VkDevice device, uint32_t queue_index);
+  explicit VulkanCommandPool(VulkanDeviceQueue* device_queue);
   ~VulkanCommandPool();
 
   bool Initialize();
   void Destroy();
 
   scoped_ptr<VulkanCommandBuffer> CreatePrimaryCommandBuffer();
   scoped_ptr<VulkanCommandBuffer> CreateSecondaryCommandBuffer();
 
   VkCommandPool handle() { return handle_; }
 
  private:
   friend class VulkanCommandBuffer;
 
   void IncrementCommandBufferCount();
   void DecrementCommandBufferCount();
 
-  VkDevice device_ = VK_NULL_HANDLE;
-  uint32_t queue_index_ = 0;
+  VulkanDeviceQueue* device_queue_;
   VkCommandPool handle_ = VK_NULL_HANDLE;
   uint32_t command_buffer_count_ = 0;
 
   DISALLOW_COPY_AND_ASSIGN(VulkanCommandPool);
 };
 
 }  // namespace gpu
 
 #endif  // GPU_VULKAN_VULKAN_COMMAND_POOL_H_