Add some copy support for vulkan msaa

src/gpu/vk/GrVkGpu.h

Index: src/gpu/vk/GrVkGpu.h
diff --git a/src/gpu/vk/GrVkGpu.h b/src/gpu/vk/GrVkGpu.h
index ff9c3c7c5fbc7ea7d5bd9a029e34db41eb7153d0..8df6e6cfdccc21622ae17525dc3a024be4f4b90d 100644
--- a/src/gpu/vk/GrVkGpu.h
+++ b/src/gpu/vk/GrVkGpu.h
@@ -82,7 +82,7 @@ public:
     void onGetMultisampleSpecs(GrRenderTarget* rt, const GrStencilSettings&,
                                int* effectiveSampleCnt, SamplePattern*) override;
 
-    bool initCopySurfaceDstDesc(const GrSurface* src, GrSurfaceDesc* desc) const override;
+    bool initDescForDstCopy(const GrRenderTarget* src, GrSurfaceDesc* desc) const override;
 
     void xferBarrier(GrRenderTarget*, GrXferBarrierType) override {}
 
@@ -220,6 +220,11 @@ private:
                            const SkIRect& srcRect,
                            const SkIPoint& dstPoint);
 
+    void copySurfaceAsResolve(GrSurface* dst,
+                              GrSurface* src,
+                              const SkIRect& srcRect,
+                              const SkIPoint& dstPoint);
+
     void copySurfaceAsDraw(GrSurface* dst,
                            GrSurface* src,
                            const SkIRect& srcRect,
@@ -236,6 +241,11 @@ private:
                               GrPixelConfig dataConfig,
                               const SkTArray<GrMipLevel>&);
 
+    void resolveImage(GrVkRenderTarget* dst,
+                      GrVkRenderTarget* src,
+                      const SkIRect& srcRect,
+                      const SkIPoint& dstPoint);
+
     SkAutoTUnref<const GrVkBackendContext> fBackendContext;
     SkAutoTUnref<GrVkCaps>                 fVkCaps;