Now closes existing background contents if app opens a new one.

chrome/browser/extensions/app_background_page_apitest.cc

 // Copyright (c) 2011 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/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/background/background_contents_service.h"
 #include "chrome/browser/background/background_contents_service_factory.h"
 #include "chrome/browser/extensions/extension_apitest.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 61 matching lines @@
       "  \"permissions\": [\"background\"]"
       "}",
       test_server()->host_port_pair().port());
 
   FilePath app_dir;
   ASSERT_TRUE(CreateApp(app_manifest, &app_dir));
   ASSERT_TRUE(LoadExtension(app_dir));
   ASSERT_TRUE(RunExtensionTest("app_background_page/basic")) << message_;
 }
 
-// Crashy, http://crbug.com/49215.
+// Crashy, http://crbug.com/69215.
 IN_PROC_BROWSER_TEST_F(AppBackgroundPageApiTest, DISABLED_LacksPermission) {
   host_resolver()->AddRule("a.com", "127.0.0.1");
   ASSERT_TRUE(StartTestServer());
 
   std::string app_manifest = base::StringPrintf(
       "{"
       "  \"name\": \"App\","
       "  \"version\": \"0.1\","
       "  \"app\": {"
       "    \"urls\": ["
@@ skipping 37 matching lines @@
 
   FilePath app_dir;
   ASSERT_TRUE(CreateApp(app_manifest, &app_dir));
   ASSERT_TRUE(LoadExtension(app_dir));
 
   const Extension* extension = GetSingleLoadedExtension();
   ASSERT_TRUE(
       BackgroundContentsServiceFactory::GetForProfile(browser()->profile())->
           GetAppBackgroundContents(ASCIIToUTF16(extension->id())));
 }
+
+IN_PROC_BROWSER_TEST_F(AppBackgroundPageApiTest, OpenTwoBackgroundPages) {
+  host_resolver()->AddRule("a.com", "127.0.0.1");
+  ASSERT_TRUE(StartTestServer());
+
+  std::string app_manifest = base::StringPrintf(
+      "{"
+      "  \"name\": \"App\","
+      "  \"version\": \"0.1\","
+      "  \"app\": {"
+      "    \"urls\": ["
+      "      \"http://a.com/\""
+      "    ],"
+      "    \"launch\": {"
+      "      \"web_url\": \"http://a.com:%d/\""
+      "    }"
+      "  },"
+      "  \"permissions\": [\"background\"]"
+      "}",
+      test_server()->host_port_pair().port());
+
+  FilePath app_dir;
+  ASSERT_TRUE(CreateApp(app_manifest, &app_dir));
+  ASSERT_TRUE(LoadExtension(app_dir));
+  ASSERT_TRUE(RunExtensionTest("app_background_page/two_pages")) << message_;
+}