[Extensions Bindings] Add a messaging test

chrome/browser/extensions/native_bindings_apitest.cc

 // Copyright 2016 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/command_line.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "extensions/common/switches.h"
 
 namespace extensions {
 
 // And end-to-end test for extension APIs using native bindings.
 class NativeBindingsApiTest : public ExtensionApiTest {
  public:
   NativeBindingsApiTest() {}
   ~NativeBindingsApiTest() override {}
 
   void SetUpCommandLine(base::CommandLine* command_line) override {
     ExtensionApiTest::SetUpCommandLine(command_line);
     // Note: We don't use a FeatureSwitch::ScopedOverride here because we need
     // the switch to be propogated to the renderer, which doesn't happen with
     // a ScopedOverride.
     command_line->AppendSwitchASCII(switches::kNativeCrxBindings, "1");
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(NativeBindingsApiTest);
 };
 
 IN_PROC_BROWSER_TEST_F(NativeBindingsApiTest, SimpleEndToEndTest) {
+  embedded_test_server()->ServeFilesFromDirectory(test_data_dir_);
+  ASSERT_TRUE(StartEmbeddedTestServer());
   ASSERT_TRUE(RunExtensionTest("native_bindings")) << message_;
 }
 
 }  // namespace extensions