Keep browser process alive while there are platform apps with background pages running.

chrome/browser/extensions/extension_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 "chrome/browser/extensions/extension_apitest.h"
 
 #include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/api/test/test_api.h"
@@ skipping 155 matching lines @@
 bool ExtensionApiTest::RunPageTest(const std::string& page_url) {
   return RunExtensionSubtest("", page_url);
 }
 
 bool ExtensionApiTest::RunPageTest(const std::string& page_url,
                                    int flags) {
   return RunExtensionSubtest("", page_url, flags);
 }
 
 bool ExtensionApiTest::RunPlatformAppTest(const char* extension_name) {
+  bool res = RunPlatformAppTestReturnImmediately(extension_name);
+  CloseShellWindowsAndWaitForAppToExit();
+  return res;
+}
+
+bool ExtensionApiTest::RunPlatformAppTestReturnImmediately(
+    const char* extension_name) {
   return RunExtensionTestImpl(extension_name, "", kFlagLaunchPlatformApp);
 }
 
 // Load |extension_name| extension and/or |page_url| and wait for
 // PASSED or FAILED notification.
 bool ExtensionApiTest::RunExtensionTestImpl(const char* extension_name,
                                             const std::string& page_url,
                                             int flags) {
   bool load_as_component = (flags & kFlagLoadAsComponent) != 0;
   bool launch_platform_app = (flags & kFlagLaunchPlatformApp) != 0;
@@ skipping 118 matching lines @@
   test_config_->SetInteger(kTestWebSocketPort,
                            websocket_server_->host_port_pair().port());
 
   return true;
 }
 
 void ExtensionApiTest::SetUpCommandLine(CommandLine* command_line) {
   ExtensionBrowserTest::SetUpCommandLine(command_line);
   test_data_dir_ = test_data_dir_.AppendASCII("api_test");
 }