Keep NaCl plugins used in app background pages alive when active.

extensions/browser/process_manager.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 "extensions/browser/process_manager.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
@@ skipping 186 matching lines @@
                  content::NotificationService::AllSources());
   registrar_.Add(this, chrome::NOTIFICATION_PROFILE_CREATED,
                  content::Source<BrowserContext>(original_context));
   registrar_.Add(this, chrome::NOTIFICATION_PROFILE_DESTROYED,
                  content::Source<BrowserContext>(context));
   if (context->IsOffTheRecord()) {
     registrar_.Add(this, chrome::NOTIFICATION_PROFILE_DESTROYED,
                    content::Source<BrowserContext>(original_context));
   }
 
+  // Note: event_page_idle_time_ must be sufficiently larger (e.g. 2x) than
+  // kKeepaliveThrottleIntervalInSeconds in ppapi/proxy/plugin_globals.
   event_page_idle_time_ = base::TimeDelta::FromSeconds(10);
   unsigned idle_time_msec = 0;
   if (base::StringToUint(CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
           extensions::switches::kEventPageIdleTime), &idle_time_msec)) {
     CHECK(idle_time_msec > 0);  // OnKeepaliveImpulseCheck requires non zero.
     event_page_idle_time_ = base::TimeDelta::FromMilliseconds(idle_time_msec);
   }
   event_page_suspending_time_ = base::TimeDelta::FromSeconds(5);
   unsigned suspending_time_msec = 0;
   if (base::StringToUint(CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
@@ skipping 645 matching lines @@
 }
 
 bool IncognitoProcessManager::IsIncognitoEnabled(const Extension* extension) {
   // Keep in sync with duplicate in extension_info_map.cc.
   ExtensionService* service = ExtensionSystem::GetForBrowserContext(
       GetBrowserContext())->extension_service();
   return extension_util::IsIncognitoEnabled(extension->id(), service);
 }
 
 }  // namespace extensions