Express (GLSL expression, possibly known value) pairs as a class

src/gpu/GrOvalRenderer.cpp

Index: src/gpu/GrOvalRenderer.cpp
diff --git a/src/gpu/GrOvalRenderer.cpp b/src/gpu/GrOvalRenderer.cpp
index 66ca05351a860755eb284cdea6e82935aecea7c8..d24702e3beb2aacf4e8fbaeb36257360380ed27a 100644
--- a/src/gpu/GrOvalRenderer.cpp
+++ b/src/gpu/GrOvalRenderer.cpp
@@ -117,9 +117,8 @@ public:
                 builder->fsCodeAppend("\tedgeAlpha *= innerAlpha;\n");
             }
 
-            SkString modulate;
-            GrGLSLModulatef<4>(&modulate, inputColor, "edgeAlpha");
-            builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.c_str());
+            builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
+                                   (GrGLSLExpr<4>(inputColor) * GrGLSLExpr<1>("edgeAlpha")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
@@ -252,9 +251,8 @@ public:
                 builder->fsCodeAppend("\tedgeAlpha *= clamp(0.5+test*invlen, 0.0, 1.0);\n");
             }
 
-            SkString modulate;
-            GrGLSLModulatef<4>(&modulate, inputColor, "edgeAlpha");
-            builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.c_str());
+            builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
+                                   (GrGLSLExpr<4>(inputColor) * GrGLSLExpr<1>("edgeAlpha")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {
@@ -413,9 +411,8 @@ public:
                 builder->fsCodeAppend("\tedgeAlpha *= clamp(0.5+test*invlen, 0.0, 1.0);\n");
             }
 
-            SkString modulate;
-            GrGLSLModulatef<4>(&modulate, inputColor, "edgeAlpha");
-            builder->fsCodeAppendf("\t%s = %s;\n", outputColor, modulate.c_str());
+            builder->fsCodeAppendf("\t%s = %s;\n", outputColor,
+                                   (GrGLSLExpr<4>(inputColor) * GrGLSLExpr<1>("edgeAlpha")).c_str());
         }
 
         static inline EffectKey GenKey(const GrDrawEffect& drawEffect, const GrGLCaps&) {