Add an arbitrary delay before unloading lazy background pages.

chrome/common/chrome_switches.h

 // 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.
 
 // Defines all the command-line switches used by Chrome.
 
 #ifndef CHROME_COMMON_CHROME_SWITCHES_H_
 #define CHROME_COMMON_CHROME_SWITCHES_H_
 #pragma once
 
 #include "build/build_config.h"
 
 #include "base/base_switches.h"
 #include "content/public/common/content_switches.h"
 
 namespace switches {
 
 // -----------------------------------------------------------------------------
 // Can't find the switch you are looking for? Try looking in
 // ui/gfx/gl/gl_switches.cc or base/base_switches.cc or
-// content/common/content_switches.cc or media/base/media_switches.cc instead.
+// content/public/common/content_switches.cc or media/base/media_switches.cc
+// instead.
 // -----------------------------------------------------------------------------
 
 // All switches in alphabetical order. The switches should be documented
 // alongside the definition of their values in the .cc file.
 extern const char kAllowCrossOriginAuthPrompt[];
 extern const char kAllowFileAccess[];
 extern const char kAllowHTTPBackgroundPage[];
 extern const char kAllowLegacyExtensionManifests[];
 extern const char kAllowNaClSocketAPI[];
 extern const char kAllowOutdatedPlugins[];
@@ skipping 139 matching lines @@
 extern const char kEnableSuggestionsTabPage[];
 extern const char kEnableSyncSignin[];
 extern const char kEnableSyncTabs[];
 extern const char kDisableSyncTabs[];
 extern const char kEnableSyncTabsForOtherClients[];
 extern const char kEnableTabGroupsContextMenu[];
 extern const char kEnableWatchdog[];
 extern const char kEnableWebsiteSettings[];
 extern const char kEnableWebSocketOverSpdy[];
 extern const char kEnableWebStoreLink[];
+extern const char kEventPageIdleTime[];
+extern const char kEventPageUnloadingTime[];
 extern const char kExperimentalSpellcheckerFeatures[];
 extern const char kExplicitlyAllowedPorts[];
 extern const char kExtensionProcess[];
 extern const char kExtensionsUpdateFrequency[];
 extern const char kExternalAutofillPopup[];
 extern const char kFlagSwitchesBegin[];
 extern const char kFlagSwitchesEnd[];
 extern const char kFeedbackServer[];
 extern const char kFileDescriptorLimit[];
 extern const char kFocusExistingTabOnOpen[];
@@ skipping 221 matching lines @@
 #else
 extern const char kEnablePrintPreview[];
 #endif
 
 // DON'T ADD RANDOM STUFF HERE. Put it in the main section above in
 // alphabetical order, or in one of the ifdefs (also in order in each section).
 
 }  // namespace switches
 
 #endif  // CHROME_COMMON_CHROME_SWITCHES_H_