Initial error handling code

src/effects/SkArithmeticMode.cpp

 /*
  * Copyright 2013 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkArithmeticMode.h"
 #include "SkColorPriv.h"
 #include "SkFlattenableBuffers.h"
@@ skipping 213 matching lines @@
         }
         if (0 == i3) {
             return SkNEW_ARGS(SkArithmeticMode_src, (i2, i4));
         }
         return SkNEW_ARGS(SkArithmeticMode_linear, (i2, i3, i4));
 #endif
     }
     return SkNEW_ARGS(SkArithmeticMode_scalar, (k1, k2, k3, k4));
 }
 
-
 //////////////////////////////////////////////////////////////////////////////
 
 #if SK_SUPPORT_GPU
 
 class GrGLArithmeticEffect : public GrGLEffect {
 public:
     GrGLArithmeticEffect(const GrBackendEffectFactory&, const GrDrawEffect&);
     virtual ~GrGLArithmeticEffect();
 
     virtual void emitCode(GrGLShaderBuilder*,
@@ skipping 176 matching lines @@
                                              background);
     }
     return true;
 }
 
 #endif
 
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_START(SkArithmeticMode)
     SK_DEFINE_FLATTENABLE_REGISTRAR_ENTRY(SkArithmeticMode_scalar)
 SK_DEFINE_FLATTENABLE_REGISTRAR_GROUP_END