Apply the layer's image filter to the hoisted image

src/gpu/GrLayerHoister.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrLayerHoister_DEFINED
 #define GrLayerHoister_DEFINED
 
 #include "SkPicture.h"
 #include "SkTDArray.h"
 
 struct GrCachedLayer;
 class GrReplacements;
+class SkGpuDevice;
 struct SkRect;
 
 class GrHoistedLayer {
 public:
     const SkPicture* fPicture;  // the picture that actually contains the layer
                                 // (not necessarily the top-most picture)
     GrCachedLayer*   fLayer;
     SkMatrix         fInitialMat;
     SkMatrix         fPreMat;
     SkMatrix         fLocalMat;
@@ skipping 69 matching lines @@
         @param context    Owner of the layer cache (and thus the layers)
         @param layers     Unneeded layers in the atlas
     */
     static void UnlockLayers(GrContext* context, const SkTDArray<GrHoistedLayer>& layers);
 
     /** Forceably remove all cached layers and release the atlas. Useful for debugging and timing.
         This is only functional when GR_CACHE_HOISTED_LAYERS is set to 1 in GrLayerCache.h
         @param context    Owner of the layer cache (and thus the layers)
      */
     static void PurgeCache(GrContext* context);
+
+private:
+    /** Update the GrTexture in 'layer' with its filtered version
+        @param context    Owner of the layer cache (and thus the layers)
+        @param device     Required by the filtering code
+        @param layer      A layer needing filtering prior to being composited
+     */
+    static void FilterLayer(GrContext* context, SkGpuDevice* device, GrCachedLayer* layer);
+
 };
 
 #endif