Do not spawn a thread in browser/interactive ui tests before spawning sandbox host process

chrome/browser/chromeos/login/kiosk_browsertest.cc

Index: chrome/browser/chromeos/login/kiosk_browsertest.cc
diff --git a/chrome/browser/chromeos/login/kiosk_browsertest.cc b/chrome/browser/chromeos/login/kiosk_browsertest.cc
index fd118815b006a17c0030b155b877e05622d0397e..fd65deba40f9e3bfd9891197374380dcdf7580b8 100644
--- a/chrome/browser/chromeos/login/kiosk_browsertest.cc
+++ b/chrome/browser/chromeos/login/kiosk_browsertest.cc
@@ -249,6 +249,9 @@ class KioskTest : public InProcessBrowserTest {
     embedded_test_server()->RegisterRequestHandler(
         base::Bind(&FakeGaia::HandleRequest, base::Unretained(&fake_gaia_)));
     ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
+    // Stop IO thread here because no threads are allowed while
+    // spawning sandbox host process. See crbug.com/322732.
+    embedded_test_server()->StopThread();
 
     mock_user_manager_.reset(new MockUserManager);
     AppLaunchController::SkipSplashWaitForTesting();
@@ -261,6 +264,11 @@ class KioskTest : public InProcessBrowserTest {
     host_resolver()->AddRule("*", "127.0.0.1");
   }
 
+  virtual void SetUpOnMainThread() OVERRIDE {
+    // Restart the thread as the sandbox host process has already been spawned.
+    embedded_test_server()->RestartThreadAndListen();
+  }
+
   virtual void CleanUpOnMainThread() OVERRIDE {
     // We need to clean up these objects in this specific order.
     fake_network_notifier_.reset(NULL);
@@ -801,6 +809,7 @@ class KioskEnterpriseTest : public KioskTest {
   }
 
   virtual void SetUpOnMainThread() OVERRIDE {
+    KioskTest::SetUpOnMainThread();
     // Configure kTestEnterpriseKioskApp in device policy.
     em::DeviceLocalAccountsProto* accounts =
         device_policy_test_helper_.device_policy()->payload()
@@ -832,8 +841,6 @@ class KioskEnterpriseTest : public KioskTest {
     base::RunLoop().RunUntilIdle();
     ASSERT_TRUE(token_service);
     token_service->SetAndSaveRefreshToken(kTestRefreshToken);
-
-    KioskTest::SetUpOnMainThread();
   }
 
   static void StorePolicyCallback(bool result) {