Move memoization of multisample specs id to GrRenderTarget

src/gpu/vk/GrVkGpu.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrVkGpu.h"
 
 #include "GrContextOptions.h"
@@ skipping 1618 matching lines @@
         (src->asTexture() && this->vkCaps().supportsCopiesAsDraws())) {
         desc->fFlags = kRenderTarget_GrSurfaceFlag;
     } else {
         // Just going to use CopyImage here
         desc->fFlags = kNone_GrSurfaceFlags;
     }
 
     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;
 }
 
 bool GrVkGpu::onGetReadPixelsInfo(GrSurface* srcSurface, int width, int height, size_t rowBytes,
                                   GrPixelConfig readConfig, DrawPreference* drawPreference,
                                   ReadPixelTempDrawInfo* tempDrawInfo) {
     // These settings we will always want if a temp draw is performed.
     tempDrawInfo->fTempSurfaceDesc.fFlags = kRenderTarget_GrSurfaceFlag;
@@ skipping 252 matching lines @@
                                                                     (VkFence*)&fence,
                                                                     VK_TRUE,
                                                                     timeout));
     return (VK_SUCCESS == result);
 }
 
 void GrVkGpu::deleteFence(GrFence fence) const {
     GR_VK_CALL(this->vkInterface(), DestroyFence(this->device(), (VkFence)fence, nullptr));
 }