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

chrome/browser/nacl_host/nacl_process_host.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 "chrome/browser/nacl_host/nacl_process_host.h"
 
 #include <algorithm>
 #include <string>
 #include <vector>
 
@@ skipping 779 matching lines @@
     // browser process.
     ppapi_host_.reset(content::BrowserPpapiHost::CreateExternalPluginProcess(
         ipc_proxy_channel_.get(),  // sender
         permissions_,
         process_->GetData().handle,
         ipc_proxy_channel_.get(),
         nacl_host_message_filter_->render_process_id(),
         render_view_id_,
         profile_directory_));
 
+    ppapi_host_->SetOnIdleChangeCallback(
+        nacl::NaClBrowser::GetDelegate()->GetOnIdleChangeCallback());
+
     ppapi::PpapiNaClChannelArgs args;
     args.off_the_record = nacl_host_message_filter_->off_the_record();
     args.permissions = permissions_;
     CommandLine* cmdline = CommandLine::ForCurrentProcess();
     DCHECK(cmdline);
     std::string flag_whitelist[] = {switches::kV, switches::kVModule};
     for (size_t i = 0; i < arraysize(flag_whitelist); ++i) {
       std::string value = cmdline->GetSwitchValueASCII(flag_whitelist[i]);
       if (!value.empty()) {
         args.switch_names.push_back(flag_whitelist[i]);
@@ skipping 204 matching lines @@
   } else {
     NaClStartDebugExceptionHandlerThread(
         process_handle.Take(), info,
         base::MessageLoopProxy::current(),
         base::Bind(&NaClProcessHost::OnDebugExceptionHandlerLaunchedByBroker,
                    weak_factory_.GetWeakPtr()));
     return true;
   }
 }
 #endif