Support javascript gtests in an extension background page.

chrome/test/base/extension_js_browser_test.h

+// 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.
+
+#ifndef CHROME_TEST_BASE_EXTENSION_JS_BROWSER_TEST_H_
+#define CHROME_TEST_BASE_EXTENSION_JS_BROWSER_TEST_H_
+
+#include "chrome/test/base/extension_load_waiter.h"
+#include "chrome/test/base/javascript_browser_test.h"
+
+// A super class that handles javascript-based tests against an extension.
+//
+// To use this class:
+//    Add (or reuse) a WaitFor* method (e.g. WaitForWebStoreExtension) to this

[Peter Lundblad, 2014/06/11 16:45:05]

Seems like the documentation is making forward-looking statements;)

[Peter Lundblad, 2014/06/11 16:45:05]

Seems like the documentation is making forward-looking statements;)

[Peter Lundblad, 2014/06/11 16:45:05]

Seems like the documentation is making forward-looking statements;)

+//    class.
+//    In your js test fixture, add on your prototype:
+//      testGenPreamble: function() {
+//        GEN('  MyLaunchMethod('extension_id');');
+//        GEN('  WaitForWebStoreExtension('extension_id');');
+//      },
+class ExtensionJSBrowserTest : public JavaScriptBrowserTest {
+ public:
+  ExtensionJSBrowserTest() : libs_loaded_(false) {}
+
+  virtual ~ExtensionJSBrowserTest() {}
+
+ protected:
+  // Waits for an extension to load.
+  void WaitFor(const char* extension_id);

[Peter Lundblad, 2014/06/11 16:45:05]

Call WaitForExtension for clarity.  Also, clarify what happens if the extension
was already loaded.

[Peter Lundblad, 2014/06/11 16:45:05]

Call WaitForExtension for clarity.  Also, clarify what happens if the extension
was already loaded.

[Peter Lundblad, 2014/06/11 16:45:05]

Call WaitForExtension for clarity.  Also, clarify what happens if the extension
was already loaded.

[David Tseng, 2014/06/11 17:52:54]

Ok.

+
+  // Method required for js2gtest.
+  // Runs |test_fixture|.|test_name| using the framework in test_api.js.
+  bool RunJavascriptTestF(bool is_async,
+                          const std::string& test_fixture,
+                          const std::string& test_name);
+
+ private:
+  ExtensionLoadWaiter load_waiter_;
+  bool libs_loaded_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExtensionJSBrowserTest);
+};
+
+#endif  // CHROME_TEST_BASE_EXTENSION_JS_BROWSER_TEST_H_