Implement color filter as GrGLEffect

src/gpu/gl/GrGLSL.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrGLSL.h"
 #include "GrGLShaderVar.h"
 #include "SkString.h"
@@ skipping 59 matching lines @@
             int cnt = GrMin((int)GR_ARRAY_COUNT(kTabs), tabCnt);
             outAppend->append(kTabs, cnt);
             tabCnt -= cnt;
         }
     }
 }
 
 void GrGLSLMulVarBy4f(SkString* outAppend,
                       unsigned tabCnt,
                       const char* vec4VarName,
-                      const GrGLSLExpr<4>& mulFactor) {
+                      const GrGLSLExpr4& mulFactor) {
     if (mulFactor.isOnes()) {
         *outAppend = SkString();
     }
 
     append_tabs(outAppend, tabCnt);
 
     if (mulFactor.isZeros()) {
         outAppend->appendf("%s = vec4(0);\n", vec4VarName);
     }
     outAppend->appendf("%s *= %s;\n", vec4VarName, mulFactor.c_str());
 }