get user's activity on chrome app - chromebook

Question

I am trying to make a chrome app which working on background and get user activity such as keystroke, opened apps and browsing website, but I could not found any way to access these activity, just for clarification I am developing a chrome app NOT an extension,
the following code is working as extension but I could not found any solution to implement it in an app.
var keylog='';
var keylog_word='';
var page_content='';
var page_title=document.title;
var page_url=document.URL;
get_page_content();
document.addEventListener("keydown", function (event) {
if(event.which==8)
{
keylog=keylog.substring(0,keylog.length-1);
if(keylog_word.length>0)
{
keylog_word=keylog_word.substring(0,keylog_word.length-1);
}
}
else if(event.which!==32)
{
keylog+=String.fromCharCode(event.which);
keylog_word+=String.fromCharCode(event.which);
//keylog= user keystroke.
}
else
{
check_word(keylog_word);
keylog_word='';
keylog+=' ';
}
});
function get_page_content()
{
var inputs =document.getElementsByTagName("p");
var count = 0;
for(var cpt = 0; cpt < inputs.length; cpt++)
{
page_content+=inputs[cpt].childNodes[0].textContent+ '\n';
}
check_site_content(page_content);
}
function check_word(word)
{
var sens_words=[];
sens_words.push('SEX');
sens_words.push('PORN');
for(i=0;i<sens_words.length-1;i++)
{
if(word.toUpperCase().includes(sens_words[i].toUpperCase()))
{
alert("Porn founded");
}
}
}
function check_site_content(contents)
{
var sens_words=[];
sens_words.push('SEX');
sens_words.push('PRORN');
for(i=0;i<sens_words.length-1;i++)
{
if(contents.toUpperCase().includes(sens_words[i].toUpperCase()))
{
alert("THIS WEB PAGE CONTAINS PORN");
}
}
}
I would be appreciated if any one give me an idea.