Step towards variable length effect keys.

src/gpu/effects/GrDitherEffect.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrDitherEffect.h"
 
 #include "gl/GrGLEffect.h"
+#include "gl/GrGLShaderBuilder.h"
 #include "gl/GrGLSL.h"
 #include "GrTBackendEffectFactory.h"
 
 #include "SkRect.h"
 
 //////////////////////////////////////////////////////////////////////////////
 
 class GLDitherEffect;
 
 class DitherEffect : public GrEffect {
@@ skipping 84 matching lines @@
     builder->fsCodeAppendf("\t\tfloat r = "
                            "fract(sin(dot(%s.xy ,vec2(12.9898,78.233))) * 43758.5453);\n",
                            builder->fragmentPosition());
     builder->fsCodeAppendf("\t\t%s = (1.0/255.0) * vec4(r, r, r, r) + %s;\n",
                            outputColor, GrGLSLExpr4(inputColor).c_str());
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrEffect* GrDitherEffect::Create() { return DitherEffect::Create(); }