Add a requiresVertexShader method to GrGLEffect

src/gpu/GrOvalRenderer.cpp

Index: src/gpu/GrOvalRenderer.cpp
diff --git a/src/gpu/GrOvalRenderer.cpp b/src/gpu/GrOvalRenderer.cpp
index 6965f9e5805eab03995f6bfe2c9ba5eb3bba9ca2..b35c6a5507c41317518826384b04e40f7804594c 100644
--- a/src/gpu/GrOvalRenderer.cpp
+++ b/src/gpu/GrOvalRenderer.cpp
@@ -85,6 +85,8 @@ 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,
@@ -199,6 +201,8 @@ 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,