Move loops that chain together effects into GrGLShaderBuilder from GrGLProgram.

R=robertphillips@google.com

Review URL: https://codereview.chromium.org/14925010

git-svn-id: http://skia.googlecode.com/svn/trunk@9073 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/gpu/gl/GrGLEffectMatrix.cpp b/src/gpu/gl/GrGLEffectMatrix.cpp
index 7e7a9c9..523b37e 100644
--- a/src/gpu/gl/GrGLEffectMatrix.cpp
+++ b/src/gpu/gl/GrGLEffectMatrix.cpp
@@ -87,7 +87,7 @@
                                    &uniName);
     }
 
-    const char* varyingName = "StageCoord";
+    const char* varyingName = "MatrixCoord";
     SkString suffixedVaryingName;
     if (NULL != suffix) {
         suffixedVaryingName.append(varyingName);