Disable Ganesh layer hoister in a more revertable form

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
 
+#define SK_IGNORE_GPU_LAYER_HOISTING
+
+
 #include "SkPicture.h"
 #include "SkTDArray.h"
 
+#if !defined(SK_IGNORE_GPU_LAYER_HOISTING) && SK_SUPPORT_GPU
+
 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;
@@ skipping 89 matching lines @@
 
 private:
     /** Update the GrTexture in 'layer' with its filtered version
         @param context    Owner of the layer cache (and thus the layers)
         @param props      Surface properties
         @param info       Layer info for a layer needing filtering prior to being composited
      */
     static void FilterLayer(GrContext* context, const SkSurfaceProps*, const GrHoistedLayer& info);
 
 };
+#endif
 
 #endif