Adds plumbing to pass WebUI mojo::Handle from browser to renderer

content/test/data/web_ui_mojo.js

+define('main', [
+    'mojo/public/bindings/js/connector',
+    'content/test/data/web_ui_test_mojo_bindings.mojom',
+], function(connector, bindings) {
+
+  function RendererTargetTest(bindings) {
+    this.bindings_ = bindings;
+  }
+
+  // TODO(aa): It is a bummer to need this stub object in JavaScript. We should
+  // have a 'client' object that contains both the sending and receiving bits of
+  // the client side of the interface. Since JS is loosely typed, we do not need
+  // a separate base class to inherit from to receive callbacks.
+  RendererTargetTest.prototype =
+      Object.create(bindings.RendererTargetStub.prototype);
+
+  RendererTargetTest.prototype.test = function() {

[darin (slow to review), 2014/03/21 00:04:52]

it looks like these few lines are repeated below.

[sky, 2014/03/21 03:19:16]

Good catch. The case is slightly different and this one (lowercase) is the one
that can be nuked.

+    this.bindings_.test();
+  };
+
+  RendererTargetTest.prototype.Test = function() {
+    this.bindings_.test();
+  };
+
+  var connection;
+
+  return function(handle) {
+    connection = new connector.Connection(handle, RendererTargetTest,
+                                          bindings.RendererTargetProxy);
+  };
+});