Interfaceify ClientPlugin in preparation for mocking it.

remoting/webapp/session_connector.js

Index: remoting/webapp/session_connector.js
diff --git a/remoting/webapp/session_connector.js b/remoting/webapp/session_connector.js
index 6d6e92b05d3545cc8450c624d2c43037467b1fa0..9d3fc019ee9d6ff8d7af120a5906d5dee2ad7546 100644
--- a/remoting/webapp/session_connector.js
+++ b/remoting/webapp/session_connector.js
@@ -21,6 +21,7 @@ var remoting = remoting || {};
  *     protocol extension messages. Returns true if a message is recognized;
  *     false otherwise.
  * @constructor
+ * @implements {remoting.SessionConnectorInterface}
  */
 remoting.SessionConnector = function(clientContainer, onConnected, onError,
                                      onExtensionMessage) {
@@ -89,14 +90,6 @@ remoting.SessionConnector = function(clientContainer, onConnected, onError,
  */
 remoting.SessionConnector.prototype.reset = function() {
   /**
-   * Set to true to indicate that the user requested pairing when entering
-   * their PIN for a Me2Me connection.
-   *
-   * @type {boolean}
-   */
-  this.pairingRequested = false;
-
-  /**
    * String used to identify the host to which to connect. For IT2Me, this is
    * the first 7 digits of the access code; for Me2Me it is the host identifier.
    *
@@ -440,7 +433,7 @@ remoting.SessionConnector.prototype.onIT2MeHostInfo_ = function(xhr) {
       console.error('Invalid "support-hosts" response from server.');
     }
   } else {
-    this.onError_(this.translateSupportHostsError(xhr.status));
+    this.onError_(this.translateSupportHostsError_(xhr.status));
   }
 };
 
@@ -570,7 +563,7 @@ remoting.SessionConnector.prototype.onHostListRefresh_ = function(success) {
  * @return {remoting.Error} The equivalent remoting.Error code.
  * @private
  */
-remoting.SessionConnector.prototype.translateSupportHostsError =
+remoting.SessionConnector.prototype.translateSupportHostsError_ =
     function(error) {
   switch (error) {
     case 0: return remoting.Error.NETWORK_FAILURE;
@@ -586,9 +579,39 @@ remoting.SessionConnector.prototype.translateSupportHostsError =
  *
  * @param {string} accessCode The access code, as entered by the user.
  * @return {string} The normalized form of the code (whitespace removed).
+ * @private
  */
 remoting.SessionConnector.prototype.normalizeAccessCode_ =
     function(accessCode) {
   // Trim whitespace.
   return accessCode.replace(/\s/g, '');
 };
+
+
+/**
+ * @constructor
+ * @implements {remoting.SessionConnectorFactory}
+ */
+remoting.DefaultSessionConnectorFactory = function() {
+};
+
+/**
+ * @param {HTMLElement} clientContainer Container element for the client view.
+ * @param {function(remoting.ClientSession):void} onConnected Callback on
+ *     success.
+ * @param {function(remoting.Error):void} onError Callback on error.
+ * @param {function(string, string):boolean} onExtensionMessage The handler for
+ *     protocol extension messages. Returns true if a message is recognized;
+ *     false otherwise.
+ */
+remoting.DefaultSessionConnectorFactory.prototype.createConnector =
+    function(clientContainer, onConnected, onError, onExtensionMessage) {
+  return new remoting.SessionConnector(
+      clientContainer, onConnected, onError, onExtensionMessage);
+};
+
+/**
+ * @type {remoting.SessionConnectorFactory}
+ */
+remoting.SessionConnector.factory =
+    new remoting.DefaultSessionConnectorFactory();