Fix crash on Linux when a normal window is created after a hidden window.

chrome/browser/apps/app_crash_browsertest.cc

Index: chrome/browser/apps/app_crash_browsertest.cc
diff --git a/chrome/browser/apps/app_crash_browsertest.cc b/chrome/browser/apps/app_crash_browsertest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..b3e12d237aa27b8f634e7578226fa6ef53389b1a
--- /dev/null
+++ b/chrome/browser/apps/app_crash_browsertest.cc
@@ -0,0 +1,32 @@
+// Copyright 2013 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/apps/app_browsertest_util.h"
+#include "chrome/browser/extensions/extension_test_message_listener.h"
+
+using namespace apps;
+
+// This class of BrowserTests is a helper to create tests related to crashes in
+// Chrome Apps. To be tested, the app will have to be placed as any other test
+// app (see PlatformAppBrowserTest) and will need to send a "Done" message back.
+// When the "Done" message is received, the test succeed. If it is not, it is
+// assumed that Chrome has crashed and the test will anyway fail.
+//
+// The entry in this file should be something like:
+// IN_PROC_BROWSER_TEST_F(AppCrashTest, <TEST_NAME>) {
+//   ASSERT_TRUE(RunAppCrashTest("<DIRECTORY_TEST_NAME>"));
+// }
+
+class AppCrashTest : public extensions::PlatformAppBrowserTest {
+public:
+  bool RunAppCrashTest(const char* name) {
+    ExtensionTestMessageListener listener("Done", false);
+    LoadAndLaunchPlatformApp(name);
+    return listener.WaitUntilSatisfied();
+  }
+};
+
+IN_PROC_BROWSER_TEST_F(AppCrashTest, HiddenWindows) {
+  ASSERT_TRUE(RunAppCrashTest("crashtest_hidden_windows"));
+}