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I’m working on a Chrome Extension: when you drag an image, it will be saved to your computer.
I learned that in HTML5 there is FileWriter API, but really can’t find any example of it, and does Chrome support it?
No, there isn’t a FileWriter API in HTML5. What you probably mean is the File API that allows you to read files. And in Chrome even extensions aren’t allowed to write files, for reasons of security. So unless you want to bundle an NPAPI plugin with your extension (which would trigger a huge warning upon installation) all you can do is trigger a download message that the user might choose to accept – or not. See Cross-browser Save As .txt for a possible approach (Flash objects like Downloadify being the other).
Edit: I was wrong, there is a FileWriter API proposal. It is very far from being done however.