add asAShadowBlur for android to drawlooper

include/effects/SkLayerDrawLooper.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 SkLayerDrawLooper_DEFINED
 #define SkLayerDrawLooper_DEFINED
 
@@ skipping 59 matching lines @@
          *      fColorMode == kDst_Mode
          *      fOffset == (0, 0)
          */
         LayerInfo();
     };
 
     virtual SkDrawLooper::Context* createContext(SkCanvas*, void* storage) const SK_OVERRIDE;
 
     virtual size_t contextSize() const SK_OVERRIDE { return sizeof(LayerDrawLooperContext); }
 
+    virtual bool asABlurShadow(BlurShadowRec* rec) const SK_OVERRIDE;
+
     SK_TO_STRING_OVERRIDE()
 
     /// Implements Flattenable.
     virtual Factory getFactory() const SK_OVERRIDE { return CreateProc; }
     static SkFlattenable* CreateProc(SkReadBuffer& buffer);
 
 protected:
     SkLayerDrawLooper();
 
     virtual void flatten(SkWriteBuffer&) const SK_OVERRIDE;
@@ skipping 62 matching lines @@
         SkLayerDrawLooper* detachLooper();
 
     private:
         Rec* fRecs;
         Rec* fTopRec;
         int  fCount;
     };
 };
 
 #endif