Add support for vertex and geometry shader textures

src/gpu/vk/GrVkTexture.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrVkTexture_DEFINED
 #define GrVkTexture_DEFINED
 
@@ skipping 10 matching lines @@
                                          GrGpuResource::LifeCycle,
                                          const GrVkImage::ImageDesc&);
                                           
 
     static GrVkTexture* CreateWrappedTexture(GrVkGpu*, const GrSurfaceDesc&,
                                              GrGpuResource::LifeCycle,
                                              VkFormat, const GrVkImage::Resource*);
 
     ~GrVkTexture() override;
 
+    GrSLType getSamplerType() const override { return kSampler2D_GrSLType; }
+
     GrBackendObject getTextureHandle() const override;
 
     void textureParamsModified() override {}
 
     const GrVkImageView* textureView() const { return fTextureView; }
 
 protected:
     enum Derived { kDerived };
 
     GrVkTexture(GrVkGpu*, const GrSurfaceDesc&, GrGpuResource::LifeCycle,
@@ skipping 11 matching lines @@
     void onAbandon() override;
     void onRelease() override;
 
 private:
     const GrVkImageView* fTextureView;
 
     typedef GrTexture INHERITED;
 };
 
 #endif