Update RT views and framebuffer in vulkan after mipmaping

src/gpu/vk/GrVkTextureRenderTarget.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 GrVkTextureRenderTarget_DEFINED
 #define GrVkTextureRenderTarget_DEFINED
@@ skipping 15 matching lines @@
 public:
     static GrVkTextureRenderTarget* CreateNewTextureRenderTarget(GrVkGpu*, SkBudgeted,
                                                                  const GrSurfaceDesc&,
                                                                  const GrVkImage::ImageDesc&);
 
     static GrVkTextureRenderTarget* CreateWrappedTextureRenderTarget(GrVkGpu*,
                                                                      const GrSurfaceDesc&,
                                                                      GrWrapOwnership,
                                                                      const GrVkImageInfo*);
 
+    bool updateForMipmap(GrVkGpu* gpu, const GrVkImageInfo& newInfo);
+
 protected:
     void onAbandon() override {
         GrVkRenderTarget::onAbandon();
         GrVkTexture::onAbandon();
     }
 
     void onRelease() override {
         GrVkRenderTarget::onRelease();
         GrVkTexture::onRelease();
     }
@@ skipping 62 matching lines @@
                                            SkBudgeted budgeted,
                                            GrVkImage::Wrapped wrapped);
 
     // GrGLRenderTarget accounts for the texture's memory and any MSAA renderbuffer's memory.
     size_t onGpuMemorySize() const override {
         return GrVkRenderTarget::onGpuMemorySize();
     }
 };
 
 #endif