@Override
    public void onClick(View v) {
        int viewId = v.getId();

        switch (viewId) {
            case R.id.start_custom_tab:
                String url = mUrlEditText.getText().toString();
                CustomTabsIntent customTabsIntent = new CustomTabsIntent.Builder().build();
                CustomTabActivityHelper.openCustomTab(
                        this, customTabsIntent, Uri.parse(url), new WebviewFallback());
                break;
            default:
                //Unknown View Clicked
        }
    }
The simplest way to use Chrome Custom Tabs. Without any customization or speeding process.
demos/src/main/java/org/chromium/customtabsdemos/SimpleCustomTabActivity.java