Support use of non-coherent memory allocations in Vulkan.

src/gpu/vk/GrVkBuffer.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrVkBuffer.h"
 #include "GrVkGpu.h"
 #include "GrVkMemory.h"
@@ skipping 133 matching lines @@
 
     VALIDATE();
     return fMapPtr;
 }
 
 void GrVkBuffer::vkUnmap(GrVkGpu* gpu) {
     VALIDATE();
     SkASSERT(this->vkIsMapped());
 
     if (fDesc.fDynamic) {
+        GrVkMemory::FlushMappedAlloc(gpu, this->alloc());
         VK_CALL(gpu, UnmapMemory(gpu->device(), this->alloc().fMemory));
     } else {
         gpu->updateBuffer(this, fMapPtr, this->offset(), this->size());
         delete [] (unsigned char*)fMapPtr;
     }
 
     fMapPtr = nullptr;
 }
 
 bool GrVkBuffer::vkIsMapped() const {
@@ skipping 28 matching lines @@
     VkResult err = VK_CALL(gpu, MapMemory(gpu->device(), alloc.fMemory,
                                           alloc.fOffset + fOffset,
                                           srcSizeInBytes, 0, &mapPtr));
 
     if (VK_SUCCESS != err) {
         return false;
     }
 
     memcpy(mapPtr, src, srcSizeInBytes);
 
+    GrVkMemory::FlushMappedAlloc(gpu, this->alloc());
     VK_CALL(gpu, UnmapMemory(gpu->device(), alloc.fMemory));
 
     return true;
 }
 
 void GrVkBuffer::validate() const {
     SkASSERT(!fResource || kVertex_Type == fDesc.fType || kIndex_Type == fDesc.fType
              || kCopyRead_Type == fDesc.fType || kCopyWrite_Type == fDesc.fType
              || kUniform_Type == fDesc.fType);
 }