Chrome OS should open to empty desktop when session restore is empty.

chrome/browser/sessions/session_restore_browsertest.cc

 // Copyright (c) 2012 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/command_line.h"
 #include "base/file_path.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/first_run/first_run.h"
@@ skipping 24 matching lines @@
 #include "content/public/browser/web_contents.h"
 #include "content/public/common/page_transition_types.h"
 #include "content/public/test/test_navigation_observer.h"
 
 #if defined(OS_MACOSX)
 #include "base/mac/scoped_nsautorelease_pool.h"
 #endif
 
 class SessionRestoreTest : public InProcessBrowserTest {
  protected:
+#if defined(OS_CHROMEOS)
+  virtual void SetUpCommandLine(CommandLine* command_line) OVERRIDE {
+    // TODO(nkostylev): Investigate if we can remove this switch.
+    command_line->AppendSwitch(switches::kCreateBrowserOnStartupForTests);
+    InProcessBrowserTest::SetUpCommandLine(command_line);
+  }
+#endif
 
   virtual void SetUpOnMainThread() OVERRIDE {
     SessionStartupPref pref(SessionStartupPref::LAST);
     SessionStartupPref::SetStartupPref(browser()->profile(), pref);
 #if defined(OS_CHROMEOS) || defined(OS_MACOSX)
     const testing::TestInfo* const test_info =
         testing::UnitTest::GetInstance()->current_test_info();
     if (strcmp(test_info->name(), "NoSessionRestoreNewWindowChromeOS")) {
       // Undo the effect of kBrowserAliveWithNoWindows in defaults.cc so that we
       // can get these test to work without quitting.
@@ skipping 780 matching lines @@
   ASSERT_EQ(1u, BrowserList::size());
   ASSERT_EQ(url1_, chrome::GetActiveWebContents(new_browser)->GetURL());
   content::NavigationController* new_controller =
       &chrome::GetActiveWebContents(new_browser)->GetController();
   ASSERT_TRUE(new_controller->GetDefaultSessionStorageNamespace());
   std::string restored_session_storage_persistent_id =
       new_controller->GetDefaultSessionStorageNamespace()->persistent_id();
   EXPECT_EQ(session_storage_persistent_id,
             restored_session_storage_persistent_id);
 }