Add mipmap loading to Vulkan.

src/gpu/GrGpu.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 GrGpu_DEFINED
 #define GrGpu_DEFINED
 
@@ skipping 494 matching lines @@
                          GrGpu::kGpuPrefersDraw_DrawPreference);
         *preference = SkTMax(*preference, elevation);
     }
 
     void handleDirtyContext() {
         if (fResetBits) {
             this->resetContext();
         }
     }
 
+    // Handles cases where a surface will be updated without a call to flushRenderTarget
+    void didWriteToSurface(GrSurface* surface, const SkIRect* bounds, uint32_t mipLevels = 1) const;
+
     Stats                                   fStats;
     SkAutoTDelete<GrPathRendering>          fPathRendering;
     // Subclass must initialize this in its constructor.
     SkAutoTUnref<const GrCaps>    fCaps;
 
 private:
     // called when the 3D context state is unknown. Subclass should emit any
     // assumed 3D context state and dirty any state cache.
     virtual void onResetContext(uint32_t resetBits) = 0;
 
@@ skipping 86 matching lines @@
     SkTArray<const MultisampleSpecs*, true>                             fMultisampleSpecsMap;
     GrTAllocator<MultisampleSpecs>                                      fMultisampleSpecsAllocator;
     // The context owns us, not vice-versa, so this ptr is not ref'ed by Gpu.
     GrContext*                                                          fContext;
 
     friend class GrPathRendering;
     typedef SkRefCnt INHERITED;
 };
 
 #endif