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

chrome/browser/extensions/app_background_page_apitest.cc

Index: chrome/browser/extensions/app_background_page_apitest.cc
diff --git a/chrome/browser/extensions/app_background_page_apitest.cc b/chrome/browser/extensions/app_background_page_apitest.cc
index 51e6313059aeca1051bb938f58238a5a8b3389de..ac1db73bc9b7b6687f6f01df6a0abf872a54444c 100644
--- a/chrome/browser/extensions/app_background_page_apitest.cc
+++ b/chrome/browser/extensions/app_background_page_apitest.cc
@@ -79,7 +79,7 @@ IN_PROC_BROWSER_TEST_F(AppBackgroundPageApiTest, MAYBE_Basic) {
   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());
@@ -137,3 +137,29 @@ IN_PROC_BROWSER_TEST_F(AppBackgroundPageApiTest, ManifestBackgroundPage) {
       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_;
+}