Add mipmap loading to Vulkan.

src/gpu/gl/GrGLGpu.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 GrGLGpu_DEFINED
 #define GrGLGpu_DEFINED
 
@@ skipping 290 matching lines @@
     // determines valid stencil formats
     void initStencilFormats();
 
     // sets a texture unit to use for texture operations other than binding a texture to a program.
     // ensures that such operations don't negatively interact with tracking bound textures.
     void setScratchTextureUnit();
 
     // bounds is region that may be modified.
     // nullptr means whole target. Can be an empty rect.
     void flushRenderTarget(GrGLRenderTarget*, const SkIRect* bounds, bool disableSRGB = false);
-    // Handles cases where a surface will be updated without a call to flushRenderTarget
-    void didWriteToSurface(GrSurface*, const SkIRect* bounds, int mipLevels = 1) const;
 
     // Need not be called if flushRenderTarget is used.
     void flushViewport(const GrGLIRect&);
 
     void flushStencil(const GrStencilSettings&);
 
     // rt is used only if useHWAA is true.
     void flushHWAAState(GrRenderTarget* rt, bool useHWAA, bool stencilEnabled);
 
     void flushMinSampleShading(float minSampleShading);
@@ skipping 241 matching lines @@
     bool fHWPLSEnabled;
     bool fPLSHasBeenUsed;
 
     float fHWMinSampleShading;
 
     typedef GrGpu INHERITED;
     friend class GrGLPathRendering; // For accessing setTextureUnit.
 };
 
 #endif