Allow GrGLEffects to produce variable length keys.

src/gpu/effects/GrYUVtoRGBEffect.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 "GrYUVtoRGBEffect.h"
 
 #include "GrCoordTransform.h"
@@ skipping 19 matching lines @@
     virtual void getConstantColorComponents(GrColor* color,
                                             uint32_t* validFlags) const SK_OVERRIDE {
         // YUV is opaque
         *color = 0xFF;
         *validFlags = kA_GrColorComponentFlag;
     }
 
     class GLEffect : public GrGLEffect {
     public:
         // this class always generates the same code.
-        static EffectKey GenKey(const GrDrawEffect&, const GrGLCaps&) { return 0; }
+        static void GenKey(const GrDrawEffect&, const GrGLCaps&, GrEffectKeyBuilder*) {}
 
         GLEffect(const GrBackendEffectFactory& factory,
                  const GrDrawEffect&)
         : INHERITED(factory) {
         }
 
         virtual void emitCode(GrGLShaderBuilder* builder,
                               const GrDrawEffect&,
-                              EffectKey,
+                              const GrEffectKey&,
                               const char* outputColor,
                               const char* inputColor,
                               const TransformedCoordsArray& coords,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             const char* yuvMatrix   = "yuvMatrix";
             builder->fsCodeAppendf("\tconst mat4 %s = mat4(1.0,  0.0,    1.402, -0.701,\n\t\t\t"
                                                           "1.0, -0.344, -0.714,  0.529,\n\t\t\t"
                                                           "1.0,  1.772,  0.0,   -0.886,\n\t\t\t"
                                                           "0.0,  0.0,    0.0,    1.0);\n",
                                    yuvMatrix);
@@ skipping 37 matching lines @@
     typedef GrEffect INHERITED;
 };
 
 }
 
 //////////////////////////////////////////////////////////////////////////////
 
 GrEffect* GrYUVtoRGBEffect::Create(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture) {
     return YUVtoRGBEffect::Create(yTexture, uTexture, vTexture);
 }