Re-land alexbost's experimental offscreenTabs API.

chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_apitest.cc

+// Copyright (c) 2012 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 "chrome/common/chrome_switches.h"
+
+class OffscreenTabsApiTest : public ExtensionApiTest {
+ public:
+  void SetUpCommandLine(CommandLine* command_line) {
+    ExtensionApiTest::SetUpCommandLine(command_line);
+    command_line->AppendSwitch(switches::kEnableExperimentalExtensionApis);
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabBasics) {
+  ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs", "crud.html")) << message_;
+}
+
+
+IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabMouseEvents) {
+  ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs",
+                                  "mouse_events.html")) << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabKeyboardEvents) {
+  ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs",
+                                  "keyboard_events.html")) << message_;
+}
+
+IN_PROC_BROWSER_TEST_F(OffscreenTabsApiTest, OffscreenTabDisplay) {
+  ASSERT_TRUE(RunExtensionSubtest("offscreen_tabs",
+                                  "display.html")) << message_;
+}