Add automatic generation of mipmaps to Vulkan

src/gpu/vk/GrVkCommandBuffer.cpp

Index: src/gpu/vk/GrVkCommandBuffer.cpp
diff --git a/src/gpu/vk/GrVkCommandBuffer.cpp b/src/gpu/vk/GrVkCommandBuffer.cpp
index 94d4c9d2bb3144c1853e3ad6c7aaa3f1984e3e05..5bd43f26b344d65dc1df740b0f26a0bab13da732 100644
--- a/src/gpu/vk/GrVkCommandBuffer.cpp
+++ b/src/gpu/vk/GrVkCommandBuffer.cpp
@@ -260,21 +260,21 @@ void GrVkCommandBuffer::copyImage(const GrVkGpu* gpu,
 }
 
 void GrVkCommandBuffer::blitImage(const GrVkGpu* gpu,
-                                  GrVkImage* srcImage,
+                                  const GrVkImage::Resource* srcImage,
                                   VkImageLayout srcLayout,
-                                  GrVkImage* dstImage,
+                                  const GrVkImage::Resource*  dstImage,
                                   VkImageLayout dstLayout,
                                   uint32_t blitRegionCount,
                                   const VkImageBlit* blitRegions,
                                   VkFilter filter) {
     SkASSERT(fIsActive);
     SkASSERT(!fActiveRenderPass);
-    this->addResource(srcImage->resource());
-    this->addResource(dstImage->resource());
+    this->addResource(srcImage);
+    this->addResource(dstImage);
     GR_VK_CALL(gpu->vkInterface(), CmdBlitImage(fCmdBuffer,
-                                                srcImage->textureImage(),
+                                                srcImage->fImage,
                                                 srcLayout,
-                                                dstImage->textureImage(),
+                                                dstImage->fImage,
                                                 dstLayout,
                                                 blitRegionCount,
                                                 blitRegions,