Update min Vulkan version to 1.0.8.0, and fix various bugs

tools/vulkan/VulkanTestContext.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 VulkanTestContext_DEFINED
 #define VulkanTestContext_DEFINED
 
@@ skipping 46 matching lines @@
     struct BackbufferInfo {
         uint32_t        fImageIndex;          // image this is associated with
         VkSemaphore     fAcquireSemaphore;    // we signal on this for acquisition of image
         VkSemaphore     fRenderSemaphore;     // we wait on this for rendering to be done
         VkCommandBuffer fTransitionCmdBuffers[2]; // to transition layout between present and render
         VkFence         fUsageFences[2];      // used to ensure this data is no longer used on GPU
     };
 
     BackbufferInfo* getAvailableBackbuffer();
     bool createSwapchain(uint32_t width, uint32_t height);
-    void createBuffers();
+    void createBuffers(VkFormat format);
     void destroyBuffers();
 
     SkAutoTUnref<const GrVkBackendContext> fBackendContext;
 
     GrContext*        fContext;
     VkSurfaceKHR      fSurface;
     VkSwapchainKHR    fSwapchain;
     uint32_t          fPresentQueueIndex;
     VkQueue           fPresentQueue;
     int               fWidth;
     int               fHeight;
     GrPixelConfig     fPixelConfig;
 
     uint32_t          fImageCount;
     VkImage*          fImages;         // images in the swapchain
     VkImageLayout*    fImageLayouts;   // layouts of these images when not color attachment
     sk_sp<SkSurface>* fSurfaces;       // wrapped surface for those images
     VkCommandPool     fCommandPool;
     BackbufferInfo*   fBackbuffers;
     uint32_t          fCurrentBackbufferIndex;
 };
 
 #endif // SK_VULKAN
 
 #endif