Add test configs for instanced rendering

src/gpu/gl/GrGLGpu.cpp

Index: src/gpu/gl/GrGLGpu.cpp
diff --git a/src/gpu/gl/GrGLGpu.cpp b/src/gpu/gl/GrGLGpu.cpp
index ec38804da377c4502f29064b090fefc263af276c..c91a0f46fab04eb9b448af9fa3e8bf2d57ce241e 100644
--- a/src/gpu/gl/GrGLGpu.cpp
+++ b/src/gpu/gl/GrGLGpu.cpp
@@ -479,10 +479,6 @@ void GrGLGpu::disconnect(DisconnectType type) {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-InstancedRendering* GrGLGpu::createInstancedRenderingIfSupported() {
-    return GLInstancedRendering::CreateIfSupported(this);
-}
-
 void GrGLGpu::onResetContext(uint32_t resetBits) {
     // we don't use the zb at all
     if (resetBits & kMisc_GrGLBackendState) {
@@ -1965,6 +1961,10 @@ GrBuffer* GrGLGpu::onCreateBuffer(size_t size, GrBufferType intendedType,
     return GrGLBuffer::Create(this, size, intendedType, accessPattern, data);
 }
 
+InstancedRendering* GrGLGpu::onCreateInstancedRendering() {
+    return new GLInstancedRendering(this);
+}
+
 void GrGLGpu::flushScissor(const GrScissorState& scissorState,
                            const GrGLIRect& rtViewport,
                            GrSurfaceOrigin rtOrigin) {