Add interface versioning. Methods queryVersion and requireVersion.

mojo/public/js/bindings.js

Index: mojo/public/js/bindings.js
diff --git a/mojo/public/js/bindings.js b/mojo/public/js/bindings.js
index 06075b513f1867f9fc8b4e612738b64a4ef0fda1..c7d9d4f5b5e175925dc4e8e5e6fedb9e756a9a48 100644
--- a/mojo/public/js/bindings.js
+++ b/mojo/public/js/bindings.js
@@ -6,7 +6,8 @@ define("mojo/public/js/bindings", [
   "mojo/public/js/core",
   "mojo/public/js/interface_types",
   "mojo/public/js/router",
-], function(core, types, router) {
+  "mojo/public/js/lib/control_message_proxy",
+], function(core, types, router, controlMessageProxy) {
 
   // ---------------------------------------------------------------------------
 
@@ -31,6 +32,7 @@ define("mojo/public/js/bindings", [
     // |router_| is lazily initialized. |handle_| is valid between bind() and
     // the initialization of |router_|.
     this.handle_ = null;
+    this.controlMessageProxy_ = new controlMessageProxy.ControlMessageProxy();
 
     if (ptrInfoOrHandle)
       this.bind(ptrInfoOrHandle);
@@ -110,13 +112,28 @@ define("mojo/public/js/bindings", [
     this.router_ = new router.Router(this.handle_);
     this.handle_ = null;
     this.router_ .setPayloadValidators([this.interfaceType_.validateResponse]);
+    this.controlMessageProxy_.receiver = this.router_;
 
     this.proxy_ = new this.interfaceType_.proxyClass(this.router_);
   };
 
-  // TODO(yzshen): Implement the following methods.
-  //   InterfacePtrController.prototype.queryVersion
-  //   InterfacePtrController.prototype.requireVersion
+  InterfacePtrController.prototype.queryVersion = function() {
+    this.configureProxyIfNecessary_();
+    return this.controlMessageProxy_.queryVersion().then(function(version) {
+      this.version = version;
+      return version;
+    });
+  };
+
+  InterfacePtrController.prototype.requireVersion = function(version) {
+    this.configureProxyIfNecessary_();
+
+    if (this.version >= version) {
+      return;
+    }
+    this.version = version;
+    this.controlMessageProxy_.requireVersion(version);
+  };
 
   // ---------------------------------------------------------------------------