Implement chrome.extension.connectExternal and fix various API inconsistencies.

chrome/browser/extensions/extension_messages_apitest.cc

Index: chrome/browser/extensions/extension_messages_apitest.cc
diff --git a/chrome/browser/extensions/extension_messages_apitest.cc b/chrome/browser/extensions/extension_messages_apitest.cc
new file mode 100755
index 0000000000000000000000000000000000000000..5b061affdd50de078b27020189129ff11d65cb93
--- /dev/null
+++ b/chrome/browser/extensions/extension_messages_apitest.cc
@@ -0,0 +1,16 @@
+// Copyright (c) 2009 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 "chrome/browser/extensions/extension_apitest.h"
+
+// Tests that message passing between extensions and content scripts works.
+IN_PROC_BROWSER_TEST_F(ExtensionApiTest, MessagingExternal) {
+  ASSERT_TRUE(LoadExtension(
+      test_data_dir_.AppendASCII("..").AppendASCII("good")
+                    .AppendASCII("Extensions")
+                    .AppendASCII("bjafgdebaacbbbecmhlhpofkepfkgcpa")
+                    .AppendASCII("1.0")));
+
+  ASSERT_TRUE(RunExtensionTest("connect_external")) << message_;
+}