Ensures the first browser in each interactive_ui_test is in the foreground

chrome/test/base/interactive_ui_tests_main.cc

 // 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/test/base/chrome_test_launcher.h"
 
 #include "build/build_config.h"
 #include "chrome/test/base/chrome_test_suite.h"
+#include "chrome/test/base/in_process_browser_test.h"
+#include "chrome/test/base/interactive_test_utils.h"
 #include "ui/base/test/ui_controls.h"
 
 #if defined(USE_AURA)
 #include "ui/aura/test/ui_controls_factory_aura.h"
 #include "ui/base/test/ui_controls_aura.h"
 #if defined(OS_LINUX) && !defined(OS_CHROMEOS)
 #include "ui/views/test/ui_controls_factory_desktop_aurax11.h"
 #endif
 #endif
 
@@ skipping 53 matching lines @@
  public:
   int RunTestSuite(int argc, char** argv) override {
     return InteractiveUITestSuite(argc, argv).Run();
   }
 };
 
 int main(int argc, char** argv) {
 #if defined(OS_WIN)
   KillAlwaysOnTopWindows(RunType::BEFORE_TEST);
 #endif
+  // TODO(sky): this causes a crash in an autofill test on macosx, figure out
+  // why: http://crbug.com/641969.
+#if !defined(OS_MACOSX)
+  // Without this it's possible for the first browser to start up in the
+  // background, generally because the last test did something that causes the
+  // test to run in the background. Most interactive ui tests assume they are in
+  // the foreground and fail in weird ways if they aren't (for example, clicks
+  // go to the wrong place). This ensures the first browser is always in the
+  // foreground.
+  InProcessBrowserTest::set_global_browser_set_up_function(
+      &ui_test_utils::BringBrowserWindowToFront);
+#endif
   // Run interactive_ui_tests serially, they do not support running in parallel.
   int default_jobs = 1;
   InteractiveUITestSuiteRunner runner;
   ChromeTestLauncherDelegate delegate(&runner);
   const int result = LaunchChromeTests(default_jobs, &delegate, argc, argv);
 #if defined(OS_WIN)
   KillAlwaysOnTopWindows(RunType::AFTER_TEST);
 #endif
   return result;
 }