Add heap tests for 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 77 matching lines @@
         , fUsedSize(0) {
         if (strategy == kSubAlloc_Strategy) {
             fAllocFunc = &GrVkHeap::subAlloc;
         } else {
             fAllocFunc = &GrVkHeap::singleAlloc;
         }
     }
 
     ~GrVkHeap();
 
+    VkDeviceSize allocSize() const { return fAllocSize; }
+    VkDeviceSize usedSize() const { return fUsedSize; }
+
     bool alloc(VkDeviceSize size, VkDeviceSize alignment, uint32_t memoryTypeIndex, 
                GrVkAlloc* alloc) {
         return (*this.*fAllocFunc)(size, alignment, memoryTypeIndex, alloc);
     }
     bool free(const GrVkAlloc& alloc);
 
 private:
     typedef bool (GrVkHeap::*AllocFunc)(VkDeviceSize size, VkDeviceSize alignment, 
                                         uint32_t memoryTypeIndex, GrVkAlloc* alloc);
 
     bool subAlloc(VkDeviceSize size, VkDeviceSize alignment, 
                   uint32_t memoryTypeIndex, GrVkAlloc* alloc);
     bool singleAlloc(VkDeviceSize size, VkDeviceSize alignment,
                      uint32_t memoryTypeIndex, GrVkAlloc* alloc);
 
     const GrVkGpu*         fGpu;
     VkDeviceSize           fSubHeapSize;
     VkDeviceSize           fAllocSize;
     VkDeviceSize           fUsedSize;
     AllocFunc              fAllocFunc;
     SkTArray<SkAutoTDelete<GrVkSubHeap>> fSubHeaps;
 };
 #endif