Fully implement onResetContext for Vulkan

src/gpu/vk/GrVkGpu.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 GrVkGpu_DEFINED
 #define GrVkGpu_DEFINED
 
@@ skipping 106 matching lines @@
                                bool byRegion,
                                VkImageMemoryBarrier* barrier) const;
     
     shaderc_compiler_t shadercCompiler() const {
         return fCompiler;
     }
 
     void finishDrawTarget() override;
 
 private:
-    void onResetContext(uint32_t resetBits) override {
-        SkDebugf("onResetContext not yet implemented for Vulkan\n");
-    }
+    void onResetContext(uint32_t resetBits) override {}
 
     GrTexture* onCreateTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle,
                                const SkTArray<GrMipLevel>&) override;
 
     GrTexture* onCreateCompressedTexture(const GrSurfaceDesc& desc, GrGpuResource::LifeCycle,
                                          const SkTArray<GrMipLevel>&) override {
         SkDebugf("onCreateCompressedTexture not yet implemented for Vulkan\n");
         return NULL;
     }
 
@@ skipping 92 matching lines @@
     shaderc_compiler_t fCompiler;
 
     // This is only for our current testing and building. The client should be holding on to the
     // VkInstance.
     VkInstance                        fVkInstance;
 
     typedef GrGpu INHERITED;
 };
 
 #endif