Support use of non-coherent memory allocations in Vulkan.

src/gpu/vk/GrVkMemory.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 GrVkMemory_DEFINED
 #define GrVkMemory_DEFINED
 
@@ skipping 19 matching lines @@
 
     bool AllocAndBindImageMemory(const GrVkGpu* gpu,
                                  VkImage image,
                                  bool linearTiling,
                                  GrVkAlloc* alloc);
     void FreeImageMemory(const GrVkGpu* gpu, bool linearTiling, const GrVkAlloc& alloc);
 
     VkPipelineStageFlags LayoutToPipelineStageFlags(const VkImageLayout layout);
 
     VkAccessFlags LayoutToSrcAccessMask(const VkImageLayout layout);
+
+    void FlushMappedAlloc(const GrVkGpu* gpu, const GrVkAlloc& alloc);
+    void InvalidateMappedAlloc(const GrVkGpu* gpu, const GrVkAlloc& alloc);
 }
 
 class GrVkFreeListAlloc {
 public:
     GrVkFreeListAlloc(VkDeviceSize size, VkDeviceSize alignment)
         : fSize(size)
         , fAlignment(alignment)
         , fFreeSize(size)
         , fLargestBlockSize(size)
         , fLargestBlockOffset(0) {
@@ skipping 99 matching lines @@
                      uint32_t memoryTypeIndex, GrVkAlloc* alloc);
 
     const GrVkGpu*         fGpu;
     VkDeviceSize           fSubHeapSize;
     VkDeviceSize           fAllocSize;
     VkDeviceSize           fUsedSize;
     AllocFunc              fAllocFunc;
     SkTArray<SkAutoTDelete<GrVkSubHeap>> fSubHeaps;
 };
 #endif