Update min Vulkan version to 1.0.8.0, and fix various bugs

src/gpu/vk/GrVkStencilAttachment.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 "GrVkStencilAttachment.h"
 #include "GrVkGpu.h"
 #include "GrVkImage.h"
@@ skipping 24 matching lines @@
                                                      int sampleCnt,
                                                      const Format& format) {
     GrVkImage::ImageDesc imageDesc;
     imageDesc.fImageType = VK_IMAGE_TYPE_2D;
     imageDesc.fFormat = format.fInternalFormat;
     imageDesc.fWidth = width;
     imageDesc.fHeight = height;
     imageDesc.fLevels = 1;
     imageDesc.fSamples = sampleCnt;
     imageDesc.fImageTiling = VK_IMAGE_TILING_OPTIMAL;
-    imageDesc.fUsageFlags = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT;
+    imageDesc.fUsageFlags = VK_IMAGE_USAGE_DEPTH_STENCIL_ATTACHMENT_BIT |
+                            VK_IMAGE_USAGE_TRANSFER_DST_BIT;
     imageDesc.fMemProps = VK_MEMORY_PROPERTY_DEVICE_LOCAL_BIT;
 
     const GrVkImage::Resource* imageResource = GrVkImage::CreateResource(gpu, imageDesc);
     if (!imageResource) {
         return nullptr;
     }
 
     const GrVkImageView* imageView = GrVkImageView::Create(gpu, imageResource->fImage,
                                                            format.fInternalFormat,
                                                            GrVkImageView::kStencil_Type);
@@ skipping 37 matching lines @@
     this->abandonImage();
     fStencilView->unrefAndAbandon();
     fStencilView = nullptr;
     GrStencilAttachment::onAbandon();
 }
 
 GrVkGpu* GrVkStencilAttachment::getVkGpu() const {
     SkASSERT(!this->wasDestroyed());
     return static_cast<GrVkGpu*>(this->getGpu());
 }