Add offset to memory allocations

This is setting up for suballocations within one large
allocation

BUG=skia:5031
GOLD_TRYBOT_URL= https://gold.skia.org/search?issue=2018933004
TBR=bsalomon@google.com

Review-Url: https://codereview.chromium.org/2018933004
diff --git a/src/gpu/vk/GrVkStencilAttachment.cpp b/src/gpu/vk/GrVkStencilAttachment.cpp
index 5976811..0343504 100644
--- a/src/gpu/vk/GrVkStencilAttachment.cpp
+++ b/src/gpu/vk/GrVkStencilAttachment.cpp
@@ -53,8 +53,7 @@
                                                            format.fInternalFormat,
                                                            GrVkImageView::kStencil_Type, 1);
     if (!imageView) {
-        VK_CALL(gpu, DestroyImage(gpu->device(), info.fImage, nullptr));
-        VK_CALL(gpu, FreeMemory(gpu->device(), info.fAlloc, nullptr));
+        GrVkImage::DestroyImageInfo(gpu, &info);
         return nullptr;
     }