Create GLSL base class for ProgramDataManager

BUG=skia:

Review URL: https://codereview.chromium.org/1428543003
diff --git a/src/gpu/effects/GrCoverageSetOpXP.cpp b/src/gpu/effects/GrCoverageSetOpXP.cpp
index 89d7565..b3fe096 100644
--- a/src/gpu/effects/GrCoverageSetOpXP.cpp
+++ b/src/gpu/effects/GrCoverageSetOpXP.cpp
@@ -81,7 +81,7 @@
         }
     }
 
-    void onSetData(const GrGLProgramDataManager&, const GrXferProcessor&) override {};
+    void onSetData(const GrGLSLProgramDataManager&, const GrXferProcessor&) override {};
 
     typedef GrGLXferProcessor INHERITED;
 };