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

chrome/browser/extensions/api/socket/socket_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/memory/ref_counted.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/extensions/api/dns/host_resolver_wrapper.h"
 #include "chrome/browser/extensions/api/dns/mock_host_resolver_creator.h"
 #include "chrome/browser/extensions/api/socket/socket_api.h"
 #include "chrome/browser/extensions/extension_apitest.h"
@@ skipping 127 matching lines @@
   catcher.RestrictToProfile(browser()->profile());
 
   ExtensionTestMessageListener listener("info_please", true);
 
   ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII("socket/api")));
   EXPECT_TRUE(listener.WaitUntilSatisfied());
   listener.Reply(
       base::StringPrintf("udp:%s:%d", host_port_pair.host().c_str(), port));
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
+  CloseShellWindowsAndWaitForAppToExit();
 }
 
 IN_PROC_BROWSER_TEST_F(SocketApiTest, SocketTCPExtension) {
   scoped_ptr<net::TestServer> test_server(
       new net::TestServer(net::TestServer::TYPE_TCP_ECHO,
                           net::TestServer::kLocalhost,
                           FilePath(FILE_PATH_LITERAL("net/data"))));
   EXPECT_TRUE(test_server->Start());
 
   net::HostPortPair host_port_pair = test_server->host_port_pair();
   int port = host_port_pair.port();
   ASSERT_TRUE(port > 0);
 
   // Test that connect() is properly resolving hostnames.
   host_port_pair.set_host("lOcAlHoSt");
 
   ResultCatcher catcher;
   catcher.RestrictToProfile(browser()->profile());
 
   ExtensionTestMessageListener listener("info_please", true);
 
   ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII("socket/api")));
   EXPECT_TRUE(listener.WaitUntilSatisfied());
   listener.Reply(
       base::StringPrintf("tcp:%s:%d", host_port_pair.host().c_str(), port));
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
+  CloseShellWindowsAndWaitForAppToExit();
 }
 
 IN_PROC_BROWSER_TEST_F(SocketApiTest, SocketTCPServerExtension) {
   ResultCatcher catcher;
   catcher.RestrictToProfile(browser()->profile());
   ExtensionTestMessageListener listener("info_please", true);
   ASSERT_TRUE(LoadExtension(test_data_dir_.AppendASCII("socket/api")));
   EXPECT_TRUE(listener.WaitUntilSatisfied());
   listener.Reply(
       base::StringPrintf("tcp_server:%s:%d", kHostname.c_str(), kPort));
 
   EXPECT_TRUE(catcher.GetNextResult()) << catcher.message();
+  CloseShellWindowsAndWaitForAppToExit();
 }
 
 IN_PROC_BROWSER_TEST_F(SocketApiTest, SocketTCPServerUnbindOnUnload) {
   ASSERT_TRUE(RunExtensionTest("socket/unload")) << message_;
+  CloseShellWindowsAndWaitForAppToExit();
   ASSERT_TRUE(RunExtensionTest("socket/unload")) << message_;
+  CloseShellWindowsAndWaitForAppToExit();
 }