In Android Webview, am I able to modify a webpage's DOM?

Suppose I load a 3rd party URL through webview.

public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        webview = (WebView) findViewById(R.id.webview);
        webview.setWebViewClient(new HelloWebViewClient());
        webview.getSettings().setJavaScriptEnabled(true);
        webview.setWebChromeClient(new MyWebChromeClient());
        webview.loadUrl("http://ebay.com");         
    }

Is it possible for me to inject something into this WebView to replace the ebay logo with my own?