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

ppapi/proxy/plugin_globals.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 "ppapi/proxy/plugin_globals.h"
 
 #include "base/task_runner.h"
 #include "base/threading/thread.h"
 #include "ipc/ipc_message.h"
 #include "ipc/ipc_sender.h"
@@ skipping 33 matching lines @@
   IPC::Sender* underlying_sender_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserSender);
 };
 
 PluginGlobals* PluginGlobals::plugin_globals_ = NULL;
 
 PluginGlobals::PluginGlobals()
     : ppapi::PpapiGlobals(),
       plugin_proxy_delegate_(NULL),
-      callback_tracker_(new CallbackTracker) {
+      callback_tracker_(new CallbackTracker),
+      plugin_has_been_active_(true) {
   DCHECK(!plugin_globals_);
   plugin_globals_ = this;
 
   // ResourceTracker asserts that we have the lock when we add new resources,
   // so we lock when creating the MessageLoopResource even though there is no
   // chance of race conditions.
   ProxyAutoLock lock;
   loop_for_main_thread_ =
       new MessageLoopResource(MessageLoopResource::ForMainThread());
 }
@@ skipping 88 matching lines @@
 base::TaskRunner* PluginGlobals::GetFileTaskRunner() {
   if (!file_thread_.get()) {
     file_thread_.reset(new base::Thread("Plugin::File"));
     base::Thread::Options options;
     options.message_loop_type = base::MessageLoop::TYPE_IO;
     file_thread_->StartWithOptions(options);
   }
   return file_thread_->message_loop_proxy();
 }
 
+void PluginGlobals::MarkPluginIsActive() {
+  plugin_has_been_active_ = true;
+}
+
 IPC::Sender* PluginGlobals::GetBrowserSender() {
   if (!browser_sender_.get()) {
     browser_sender_.reset(
         new BrowserSender(plugin_proxy_delegate_->GetBrowserSender()));
   }
 
   return browser_sender_.get();
 }
 
 std::string PluginGlobals::GetUILanguage() {
@@ skipping 16 matching lines @@
 MessageLoopResource* PluginGlobals::loop_for_main_thread() {
   return loop_for_main_thread_.get();
 }
 
 bool PluginGlobals::IsPluginGlobals() const {
   return true;
 }
 
 }  // namespace proxy
 }  // namespace ppapi