Add a requiresVertexShader method to GrGLEffect

src/gpu/GrAARectRenderer.cpp

Index: src/gpu/GrAARectRenderer.cpp
diff --git a/src/gpu/GrAARectRenderer.cpp b/src/gpu/GrAARectRenderer.cpp
index 9d436c39336714ff15474d3aabb42a5a0a9e4327..b104df5d24a7576053277be370c4adacc5f03e44 100644
--- a/src/gpu/GrAARectRenderer.cpp
+++ b/src/gpu/GrAARectRenderer.cpp
@@ -44,6 +44,8 @@ public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
 
+        virtual bool requiresVertexShader(const GrDrawEffect&) const SK_OVERRIDE { return true; }
+
         virtual void emitCode(GrGLShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,
@@ -164,6 +166,8 @@ public:
         GLEffect(const GrBackendEffectFactory& factory, const GrDrawEffect&)
         : INHERITED (factory) {}
 
+        virtual bool requiresVertexShader(const GrDrawEffect&) const SK_OVERRIDE { return true; }
+
         virtual void emitCode(GrGLShaderBuilder* builder,
                               const GrDrawEffect& drawEffect,
                               EffectKey key,