Add support for writing unit tests for Mojo-backed apps/extensions APIs.

extensions/test/extensions_unittests_main.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/base_paths.h"
 #include "base/bind.h"
 #include "base/macros.h"
 #include "base/path_service.h"
 #include "base/test/launcher/unit_test_launcher.h"
 #include "content/public/common/content_client.h"
 #include "content/public/test/content_test_suite_base.h"
 #include "content/public/test/unittest_test_suite.h"
 #include "extensions/common/constants.h"
 #include "extensions/common/extension_paths.h"
 #include "extensions/test/test_extensions_client.h"
+#include "mojo/embedder/embedder.h"
 #include "ui/base/resource/resource_bundle.h"
 
 namespace {
 
 // Content client that exists only to register chrome-extension:// scheme with
 // the url module.
 // TODO(jamescook): Should this be merged with ShellContentClient? Should this
 // be a persistent object available to tests?
 class ExtensionsContentClient : public content::ContentClient {
  public:
@@ skipping 63 matching lines @@
 
   ui::ResourceBundle::CleanupSharedInstance();
   content::ContentTestSuiteBase::Shutdown();
 }
 
 }  // namespace
 
 int main(int argc, char** argv) {
   content::UnitTestTestSuite test_suite(new ExtensionsTestSuite(argc, argv));
 
+  mojo::embedder::Init();
   return base::LaunchUnitTests(argc,
                                argv,
                                base::Bind(&content::UnitTestTestSuite::Run,
                                           base::Unretained(&test_suite)));
 }