Add "sample locations" feature to GrProcessor

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 1063 matching lines @@
     }
 
     if (can_copy_as_draw(dst, src, this)) {
         this->copySurfaceAsDraw(dst, src, srcRect, dstPoint);
         return true;
     }
 
     return false;
 }
 
+void GrVkGpu::onGetMultisampleSpecs(GrRenderTarget* rt, const GrStencilSettings&,
+                                    int* effectiveSampleCnt, SkAutoTDeleteArray<SkPoint>*) {
+    // 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) {
     // Currently we don't handle draws, so if the caller wants/needs to do a draw we need to fail
     if (kNoDraw_DrawPreference != *drawPreference) {
         return false;
     }
 
     if (srcSurface->config() != readConfig) {
         // TODO: This should fall back to drawing or copying to change config of srcSurface to match
@@ skipping 169 matching lines @@
     int set_a_break_pt_here = 9;
     aglSwapBuffers(aglGetCurrentContext());
 #elif defined(SK_BUILD_FOR_WIN32)
     SwapBuf();
     int set_a_break_pt_here = 9;
     SwapBuf();
 #endif
 #endif
 }