Filesystem won't grant any space to my Chrome extension - google-chrome

Question

I'm working on a chrome extension and testing it as an unpacked extension.
I managed to get to the point where I can request a quota and request a filesystem, but it won't grant any space.
From the background.js:
chrome.runtime.onMessage.addListener(
function()
{
navigator.webkitPersistentStorage.queryUsageAndQuota(
function(usedQuota, grantedQuota)
{
console.log(usedQuota + " of " + grantedQuota);
}
);
let requestedBytes = 1024 * 1024 * 10; //10mb
navigator.webkitPersistentStorage.requestQuota(
requestedBytes,
function(grantedBytes)
{
window.webkitRequestFileSystem(
PERSISTENT,
grantedBytes,
function (filesystem)
{
console.log("Name: " + filesystem.name);
console.log("Requested Size " + (requestedBytes / 1024 / 1024))
console.log("Granted Size: " + (grantedBytes / 1024 / 1024));
},
function (fileerror) {console.log("Error: " + fileerror);}
)
}
);
}
);
I have an index.html that sends a message, which activates the above code.
But this is all I can get it to output:
0 of 0
background.js:29 Name: chrome-extension_dpgmepaclcikglfooaopnbockbeenlbd_0:Persistent
background.js:30 Requested Size 10
background.js:31 Granted Size: 0
manifest.json:
{
"manifest_version": 2,
"name": "SomeRandomName",
"version": "0.1",
"browser_action":
{
},
"permissions":
[
],
"background":
{
"scripts": ["background.js"],
"persistent": false
},
"content_security_policy": "script-src 'self' 'sha256-d8KCEnecXtiRMS4Kj2vm8/UElPKEk5YsgZWRWitb0O8='; object-src 'self'" //debug
}
What's going on here?

Answer 1

Apparently putting "unlimitedStorage" in permissions fixes it. But I thought there was a way to do it without asking for unlimited storage.