Move memoization of multisample specs id to GrRenderTarget

src/gpu/vk/GrVkGpu.cpp

Index: src/gpu/vk/GrVkGpu.cpp
diff --git a/src/gpu/vk/GrVkGpu.cpp b/src/gpu/vk/GrVkGpu.cpp
index 7d75921c238419e96b27ceb3b893f55f793ecf98..eb6111beca6b798a3e5442f2c814360f117bd838 100644
--- a/src/gpu/vk/GrVkGpu.cpp
+++ b/src/gpu/vk/GrVkGpu.cpp
@@ -1636,8 +1636,8 @@ bool GrVkGpu::initDescForDstCopy(const GrRenderTarget* src, GrSurfaceDesc* desc)
     return true;
 }
 
-void GrVkGpu::onGetMultisampleSpecs(GrRenderTarget* rt, const GrStencilSettings&,
-                                    int* effectiveSampleCnt, SamplePattern*) {
+void GrVkGpu::onQueryMultisampleSpecs(GrRenderTarget* rt, const GrStencilSettings&,
+                                      int* effectiveSampleCnt, SamplePattern*) {
     // TODO: stub.
     SkASSERT(!this->caps()->sampleLocationsSupport());
     *effectiveSampleCnt = rt->desc().fSampleCnt;