Move some of the adding stencil attachment logic of Gpu and into Render Target.

src/gpu/GrTest.cpp

 
 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrTest.h"
 
@@ skipping 238 matching lines @@
 
     bool onWritePixels(GrSurface* surface,
                        int left, int top, int width, int height,
                        GrPixelConfig config, const void* buffer,
                        size_t rowBytes) override {
         return false;
     }
 
     void onResolveRenderTarget(GrRenderTarget* target) override { return; }
 
-    bool createStencilAttachmentForRenderTarget(GrRenderTarget*, int width, int height) override {
-        return false;
-    }
-
-    bool attachStencilAttachmentToRenderTarget(GrStencilAttachment*, GrRenderTarget*) override {
-        return false;
+    GrStencilAttachment* createStencilAttachmentForRenderTarget(const GrRenderTarget*,
+                                                                int width,
+                                                                int height) override {
+        return nullptr;
     }
 
     void clearStencil(GrRenderTarget* target) override  {}
 
     GrBackendObject createTestingOnlyBackendTexture(void* pixels, int w, int h,
                                                     GrPixelConfig config) const override {
         return 0; 
     }
     bool isTestingOnlyBackendTexture(GrBackendObject id) const override { return false; }
     void deleteTestingOnlyBackendTexture(GrBackendObject id) const override {}
@@ skipping 14 matching lines @@
     SkASSERT(nullptr == fGpu);
     fGpu = new MockGpu(this, options);
     SkASSERT(fGpu);
     this->initCommon();
 
     // We delete these because we want to test the cache starting with zero resources. Also, none of
     // these objects are required for any of tests that use this context. TODO: make stop allocating
     // resources in the buffer pools.
     fDrawingMgr.abandon();
 }