Update RT views and framebuffer in vulkan after mipmaping

src/gpu/vk/GrVkTexture.cpp

Index: src/gpu/vk/GrVkTexture.cpp
diff --git a/src/gpu/vk/GrVkTexture.cpp b/src/gpu/vk/GrVkTexture.cpp
index 5d15311cbfe7e079d4bd5275938a25780365b24b..07da037b3b3d992d8926560f88ac117e4da627fc 100644
--- a/src/gpu/vk/GrVkTexture.cpp
+++ b/src/gpu/vk/GrVkTexture.cpp
@@ -9,6 +9,7 @@
 #include "GrVkGpu.h"
 #include "GrVkImageView.h"
 #include "GrTexturePriv.h"
+#include "GrVkTextureRenderTarget.h"
 #include "GrVkUtil.h"
 
 #include "vk/GrVkTypes.h"
@@ -161,7 +162,7 @@ const GrVkImageView* GrVkTexture::textureView(bool allowSRGB) {
     return fLinearTextureView;
 }
 
-bool GrVkTexture::reallocForMipmap(const GrVkGpu* gpu, uint32_t mipLevels) {
+bool GrVkTexture::reallocForMipmap(GrVkGpu* gpu, uint32_t mipLevels) {
     if (mipLevels == 1) {
         // don't need to do anything for a 1x1 texture
         return false;
@@ -174,7 +175,6 @@ bool GrVkTexture::reallocForMipmap(const GrVkGpu* gpu, uint32_t mipLevels) {
         return false;
     }
 
-    // Does this even make sense for rendertargets?
     bool renderTarget = SkToBool(fDesc.fFlags & kRenderTarget_GrSurfaceFlag);
 
     VkImageUsageFlags usageFlags = VK_IMAGE_USAGE_SAMPLED_BIT;
@@ -209,6 +209,14 @@ bool GrVkTexture::reallocForMipmap(const GrVkGpu* gpu, uint32_t mipLevels) {
         return false;
     }
 
+    if (renderTarget) {
+        GrVkTextureRenderTarget* texRT = static_cast<GrVkTextureRenderTarget*>(this);
+        if (!texRT->updateForMipmap(gpu, info)) {
+            GrVkImage::DestroyImageInfo(gpu, &info);
+            return false;
+        }
+    }
+
     oldResource->unref(gpu);
     oldView->unref(gpu);
     if (fLinearTextureView) {