Potentially optimize some GrGLEffects for known input color values

src/gpu/GrAARectRenderer.cpp

Index: src/gpu/GrAARectRenderer.cpp
diff --git a/src/gpu/GrAARectRenderer.cpp b/src/gpu/GrAARectRenderer.cpp
index ee7c024fe81aab548e9493dccd3cc721c759e70c..fec3e11f1babbe04340babb30b3ca63e04173187 100644
--- a/src/gpu/GrAARectRenderer.cpp
+++ b/src/gpu/GrAARectRenderer.cpp
@@ -49,7 +49,7 @@ public:
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
-                              const char* inputColor,
+                              const GrGLSLExpr4& inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             // setup the varying for the Axis aligned rect effect
@@ -86,7 +86,7 @@ public:
 
 
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
-                                   (GrGLSLExpr4(inputColor) * GrGLSLExpr1("coverage")).c_str());
+                                   (inputColor * GrGLSLExpr1("coverage")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
@@ -167,7 +167,7 @@ public:
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
                               const char* outputColor,
-                              const char* inputColor,
+                              const GrGLSLExpr4& inputColor,
                               const TransformedCoordsArray&,
                               const TextureSamplerArray& samplers) SK_OVERRIDE {
             // setup the varying for the center point and the unit vector
@@ -219,7 +219,7 @@ public:
 
 
             builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
-                                   (GrGLSLExpr4(inputColor) * GrGLSLExpr1("coverage")).c_str());
+                                   (inputColor * GrGLSLExpr1("coverage")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {