Initialize the mixin(Behavior) file

@inner
@param {Array.<string>} mixins the mixin file paths
@param {Object} buildManager the build manager
@param {Object} file the file that refers the mixin files
function initMixinFile(mixins, buildManager, file) {
    mixins && mixins.forEach(modulePath => {
        let {resolvedModIds: cacheResolveModIds} = file;
        let cacheInfo = cacheResolveModIds[modulePath];
        let mixinFile = cacheInfo && cacheInfo.file;
        if (mixinFile && !mixinFile.isBehavior) {
            mixinFile.isBehavior = true;
        }
    });
}