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

ppapi/proxy/plugin_globals.h

Index: ppapi/proxy/plugin_globals.h
diff --git a/ppapi/proxy/plugin_globals.h b/ppapi/proxy/plugin_globals.h
index bc55245d611a10c5dc154529a1749b595ef86134..834584f2edd58068ef76b8d8839dc81788d366a9 100644
--- a/ppapi/proxy/plugin_globals.h
+++ b/ppapi/proxy/plugin_globals.h
@@ -73,6 +73,7 @@ class PPAPI_PROXY_EXPORT PluginGlobals : public PpapiGlobals {
                                       const std::string& value) OVERRIDE;
   virtual MessageLoopShared* GetCurrentMessageLoop() OVERRIDE;
   base::TaskRunner* GetFileTaskRunner() OVERRIDE;
+  virtual void MarkPluginIsActive() OVERRIDE;
 
   // Returns the channel for sending to the browser.
   IPC::Sender* GetBrowserSender();
@@ -128,6 +129,9 @@ class PPAPI_PROXY_EXPORT PluginGlobals : public PpapiGlobals {
   // The embedder should call this function when the command line is known.
   void set_command_line(const std::string& c) { command_line_ = c; }
 
+  bool plugin_has_been_active() const { return plugin_has_been_active_; }
+  void set_plugin_has_been_active(bool b) { plugin_has_been_active_ = b; }
+
  private:
   class BrowserSender;
 
@@ -160,6 +164,11 @@ class PPAPI_PROXY_EXPORT PluginGlobals : public PpapiGlobals {
   // lazily, since it might not be needed.
   scoped_ptr<base::Thread> file_thread_;
 
+  // Indicates activity by the plugin. Used to monitor when a plugin can be
+  // shutdown due to idleness.
+  // TODO(scheib) Mark that this is OK to hit from any thread

[dmichael (off chromium), 2013/11/06 22:39:21]

Virtually all the ppapi/proxy stuff is guarded by ppapi::ProxyLock
(ppapi/shared_impl/proxy_lock.h). So this goes without saying.

[scheib, 2013/11/15 01:22:17]

Done.

+  bool plugin_has_been_active_;
+
   DISALLOW_COPY_AND_ASSIGN(PluginGlobals);
 };