Add WebGLRenderStates.d.ts

src/renderers/webgl/WebGLMorphtargets.d.ts

+import { Object3D } from '../../core/Object3D';
+import { BufferGeometry } from '../../core/BufferGeometry';
+import { Material } from '../../materials/Material';
+import { WebGLProgram } from './WebGLProgram';
+
+export class WebGLMorphtargets {
+
+	constructor( gl: WebGLRenderingContext );
+
+	update( object: Object3D, geometry: BufferGeometry, material: Material, program: WebGLProgram ): void;
+
+}