Fix gcc warnings in Vulkan backend

src/gpu/vk/GrVkImage.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 GrVkImage_DEFINED
 #define GrVkImage_DEFINED
 
@@ skipping 19 matching lines @@
 
         VkImage                  fImage;
         VkDeviceMemory           fAlloc;
         VkFormat                 fFormat;
         uint32_t                 fFlags;
 
         Resource()
             : INHERITED()
             , fImage(VK_NULL_HANDLE)
             , fAlloc(VK_NULL_HANDLE)
-            , fFlags(kNo_Flags)
-            , fFormat(VK_FORMAT_UNDEFINED) {}
+            , fFormat(VK_FORMAT_UNDEFINED)
+            , fFlags(kNo_Flags) {}
 
         Resource(VkImage image, VkDeviceMemory alloc, uint32_t flags, VkFormat format)
-            : fImage(image), fAlloc(alloc), fFlags(flags), fFormat(format) {}
+            : fImage(image), fAlloc(alloc), fFormat(format), fFlags(flags) {}
 
         ~Resource() override {}
 
     private:
         void freeGPUData(const GrVkGpu* gpu) const override;
 
         typedef GrVkResource INHERITED;
     };
 
     // for wrapped textures
@@ skipping 64 matching lines @@
     void releaseImage(const GrVkGpu* gpu);
     void abandonImage();
 
     const Resource* fResource;
 
     VkImageLayout   fCurrentLayout;
 
 };
 
 #endif