Adding missing SK_API identifier to class so that it's accessible in debug blink.

include/effects/SkPerlinNoiseShader.h

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPerlinNoiseShader_DEFINED
 #define SkPerlinNoiseShader_DEFINED
 
 #include "SkShader.h"
 
 /** \class SkPerlinNoiseShader
 
     SkPerlinNoiseShader creates an image using the Perlin turbulence function.
 
     It can produce tileable noise if asked to stitch tiles and provided a tile size.
     In order to fill a large area with repeating noise, set the stitchTiles flag to
     true, and render exactly a single tile of noise. Without this flag, the result
     will contain visible seams between tiles.
 
     The algorithm used is described here :
     http://www.w3.org/TR/SVG/filters.html#feTurbulenceElement
 */
-class SkPerlinNoiseShader : public SkShader {
+class SK_API SkPerlinNoiseShader : public SkShader {
     struct PaintingData;
 public:
     struct StitchData;
 
     /**
      *  About the noise types : the difference between the 2 is just minor tweaks to the algorithm,
      *  they're not 2 entirely different noises. The output looks different, but once the noise is
      *  generated in the [1, -1] range, the output is brought back in the [0, 1] range by doing :
      *  kFractalNoise_Type : noise * 0.5 + 0.5
      *  kTurbulence_Type   : abs(noise)
@@ skipping 66 matching lines @@
     SkISize fTileSize;
     bool fStitchTiles;
     SkMatrix fMatrix;
 
     PaintingData* fPaintingData;
 
     typedef SkShader INHERITED;
 };
 
 #endif