Experimental 'purging and suspending' backgrounded tabs behind the flag

chrome/browser/memory/tab_manager_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/base_switches.h"
 #include "base/command_line.h"
 #include "base/memory/memory_pressure_listener.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "build/build_config.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
 #include "chrome/browser/media/media_stream_capture_indicator.h"
 #include "chrome/browser/memory/tab_manager.h"
 #include "chrome/browser/memory/tab_manager_web_contents_data.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/common/chrome_features.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/in_process_browser_test.h"
 #include "chrome/test/base/interactive_test_utils.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_types.h"
 #include "content/public/common/content_switches.h"
 #include "content/public/test/test_utils.h"
 #include "url/gurl.h"
 
 using content::OpenURLParams;
 
 #if defined(OS_WIN) || defined(OS_MACOSX) || defined(OS_LINUX)
 
 namespace memory {
 
 class TabManagerTest : public InProcessBrowserTest {
  public:
   // Tab discarding is enabled by default on CrOS. On other platforms, force it
   // by turning on the corresponding experiment as some tests assume this
   // behavior it turned on.
   void SetUpCommandLine(base::CommandLine* command_line) override {
 #if !defined(OS_LINUX)
     command_line->AppendSwitchASCII(switches::kEnableFeatures,
                                     features::kAutomaticTabDiscarding.name);
 #endif
+    command_line->AppendSwitchASCII(switches::kPurgeAndSuspendTime, "1");

[Georges Khalil, 2016/05/10 18:58:58]

Do we need this here?

[hajimehoshi, 2016/05/11 07:23:31]

No, Done.

   }
 };
 
 IN_PROC_BROWSER_TEST_F(TabManagerTest, TabManagerBasics) {
   using content::WindowedNotificationObserver;
   TabManager* tab_manager = g_browser_process->GetTabManager();
   ASSERT_TRUE(tab_manager);
   EXPECT_FALSE(tab_manager->recent_tab_discard());
 
   // Disable the protection of recent tabs.
@@ skipping 333 matching lines @@
 
   // Remove the video stream.
   video_stream_ui.reset();
 
   // Should be able to discard the background tab now.
   EXPECT_TRUE(tab_manager->DiscardTabImpl());
 }
 
 }  // namespace memory
 
-#endif  // OS_WIN || OS_CHROMEOS
+#endif  // OS_WIN || OS_MAXOSX || OS_LINUX