Add mipmap loading to 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 174 matching lines @@
                            GrVkImage* dstImage,
                            GrVkImage* srcImage,
                            const SkIRect& srcRect,
                            const SkIPoint& dstPoint);
 
     void copySurfaceAsDraw(GrSurface* dst,
                            GrSurface* src,
                            const SkIRect& srcRect,
                            const SkIPoint& dstPoint);
 
-    // helper for onCreateTexture and writeTexturePixels
-    bool uploadTexData(GrVkTexture* tex,
-                       int left, int top, int width, int height,
-                       GrPixelConfig dataConfig,
-                       const void* data,
-                       size_t rowBytes);
+    // helpers for onCreateTexture and writeTexturePixels
+    bool uploadTexDataLinear(GrVkTexture* tex,
+                             int left, int top, int width, int height,
+                             GrPixelConfig dataConfig,
+                             const void* data,
+                             size_t rowBytes);
+    bool uploadTexDataOptimal(GrVkTexture* tex,
+                              int left, int top, int width, int height,
+                              GrPixelConfig dataConfig,
+                              const SkTArray<GrMipLevel>&);
 
     SkAutoTUnref<const GrVkBackendContext> fBackendContext;
     SkAutoTUnref<GrVkCaps>                 fVkCaps;
 
     // These Vulkan objects are provided by the client, and also stored in fBackendContext.
     // They're copied here for convenient access.
     VkInstance                             fVkInstance;
     VkDevice                               fDevice;
     VkQueue                                fQueue;    // Must be Graphics queue
 
@@ skipping 10 matching lines @@
 
     // Shaderc compiler used for compiling glsl in spirv. We only want to create the compiler once
     // since there is significant overhead to the first compile of any compiler.
     shaderc_compiler_t fCompiler;
 
 
     typedef GrGpu INHERITED;
 };
 
 #endif