Potentially optimize some GrGLEffects for known input color values

src/gpu/gl/GrGLVertexEffect.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 GrGLVertexEffect_DEFINED
 #define GrGLVertexEffect_DEFINED
 
@@ skipping 10 matching lines @@
         : INHERITED(factory) { fIsVertexEffect = true; }
 
     /**
      * This is similar to emitCode() in the base class, except it takes a full shader builder.
      * This allows the effect subclass to emit vertex code.
      */
     virtual void emitCode(GrGLFullShaderBuilder* builder,
                           const GrDrawEffect& drawEffect,
                           EffectKey key,
                           const char* outputColor,
-                          const char* inputColor,
+                          const GrGLSLExpr4& inputColor,
                           const TransformedCoordsArray& coords,
                           const TextureSamplerArray& samplers) = 0;
 
     /**
      * Provide a default override for base class's emitCode() function.
      */
     virtual void emitCode(GrGLShaderBuilder* builder,
                           const GrDrawEffect& drawEffect,
                           EffectKey key,
                           const char* outputColor,
-                          const char* inputColor,
+                          const GrGLSLExpr4& inputColor,
                           const TransformedCoordsArray& coords,
                           const TextureSamplerArray& samplers) SK_OVERRIDE {
         GrCrash("GrGLVertexEffect requires GrGLFullShaderBuilder* overload for emitCode().");
     }
 
 private:
     typedef GrGLEffect INHERITED;
 };
 
 #endif