Fix layer hoisting image filter corner cases

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
 
@@ skipping 90 matching lines @@
     /** 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
+        @param info       Layer info for a layer needing filtering prior to being composited
      */
-    static void FilterLayer(GrContext* context, SkGpuDevice* device, GrCachedLayer* layer);
+    static void FilterLayer(GrContext* context, SkGpuDevice* device, const GrHoistedLayer& info);
 
 };
 
 #endif