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

src/gpu/gl/GrGLRenderTarget.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 
 #ifndef GrGLRenderTarget_DEFINED
 #define GrGLRenderTarget_DEFINED
@@ skipping 60 matching lines @@
 
     void init(const GrSurfaceDesc&, const IDDesc&);
 
     void onAbandon() override;
     void onRelease() override;
 
     // In protected because subclass GrGLTextureRenderTarget calls this version.
     size_t onGpuMemorySize() const override;
 
 private:
+    GrGLGpu* getGLGpu() const;
+    bool completeStencilAttachment() override;
+
     GrGLuint    fRTFBOID;
     GrGLuint    fTexFBOID;
     GrGLuint    fMSColorRenderbufferID;
 
     // We track this separately from GrGpuResource because this may be both a texture and a render
     // target, and the texture may be wrapped while the render target is not.
     LifeCycle   fRTLifecycle;
 
     // when we switch to this render target we want to set the viewport to
     // only render to content area (as opposed to the whole allocation) and
     // we want the rendering to be at top left (GL has origin in bottom left)
     GrGLIRect   fViewport;
 
     // onGpuMemorySize() needs to know the VRAM footprint of the FBO(s). However, abandon and
     // release zero out the IDs and the cache needs to know the size even after those actions.
     size_t      fGpuMemorySize;
 
     typedef GrRenderTarget INHERITED;
 };
 
 #endif