bridgev2/login: add LoginCookiesParams.Hidden boolean field

bridgev2/login.go

@@ -183,6 +183,9 @@ type LoginCookiesParams struct {
 	// even if this URL is not reached, but it should only automatically close the webview after
 	// both cookies and the URL match.
 	WaitForURLPattern string `json:"wait_for_url_pattern,omitempty"`
+	// If set, the client should load the URL and run ExtractJS in a webview that is not shown to the
+	// user.
+	Hidden bool `json:"hidden,omitempty"`
 }
 
 type LoginInputFieldType string

bridgev2/matrix/provisioning.yaml

@@ -855,6 +855,9 @@ components:
                   A JavaScript snippet that can extract some or all of the fields.
                   The snippet will evaluate to a promise that resolves when the relevant fields are found.
                   Fields that are not present in the promise result must be extracted another way.
+              hidden:
+                type: boolean
+                description: If set, the client should load the URL and run `extract_js` in a webview that is not shown to the user.
               fields:
                 type: array
                 description: The list of cookies or other stored data that must be extracted.