Add a requiresVertexShader method to GrGLEffect

src/gpu/effects/GrSimpleTextureEffect.cpp

Index: src/gpu/effects/GrSimpleTextureEffect.cpp
diff --git a/src/gpu/effects/GrSimpleTextureEffect.cpp b/src/gpu/effects/GrSimpleTextureEffect.cpp
index ccf761ab946c96e8d1e5ab3dbe5d7e804aaf5eca..97e711e8d2a170c0b341a1ad69ae7ed071f92353 100644
--- a/src/gpu/effects/GrSimpleTextureEffect.cpp
+++ b/src/gpu/effects/GrSimpleTextureEffect.cpp
@@ -24,6 +24,11 @@ public:
         }
     }
 
+    virtual bool requiresVertexShader(const GrDrawEffect& drawEffect) const SK_OVERRIDE {
+        const GrSimpleTextureEffect& ste = drawEffect.castEffect<GrSimpleTextureEffect>();
+        return GrEffect::kCustom_CoordsType == ste.coordsType();
+    }
+
     virtual void emitCode(GrGLShaderBuilder* builder,
                           const GrDrawEffect& drawEffect,
                           EffectKey key,