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

content/public/browser/browser_ppapi_host.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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_
 
 #include "base/callback_forward.h"
 #include "base/process/process.h"
 #include "content/common/content_export.h"
@@ skipping 16 matching lines @@
 
 namespace content {
 
 // Interface that allows components in the embedder app to talk to the
 // PpapiHost in the browser process.
 //
 // There will be one of these objects in the browser per plugin process. It
 // lives entirely on the I/O thread.
 class CONTENT_EXPORT BrowserPpapiHost {
  public:
+  struct OnIdleChangeInstanceStruct {
+    int render_process_id;
+    int render_view_id;
+    GURL document_url;
+  };
+  typedef std::vector<OnIdleChangeInstanceStruct> OnIdleChangeInstanceData;
+  typedef base::Callback<
+      void (OnIdleChangeInstanceData intance_data,
+            base::FilePath profile_data_directory,
+            bool idle)>
+      OnIdleChangeCallback;
+
   // Creates a browser host and sets up an out-of-process proxy for an external
   // pepper plugin process.
   static BrowserPpapiHost* CreateExternalPluginProcess(
       IPC::Sender* sender,
       ppapi::PpapiPermissions permissions,
       base::ProcessHandle plugin_child_process,
       IPC::ChannelProxy* channel,
       int render_process_id,
       int render_view_id,
       const base::FilePath& profile_directory);
@@ skipping 27 matching lines @@
 
   // Returns the path of the plugin.
   virtual const base::FilePath& GetPluginPath() = 0;
 
   // Returns the user's profile data directory.
   virtual const base::FilePath& GetProfileDataDirectory() = 0;
 
   // Get the Document/Plugin URLs for the given PP_Instance.
   virtual GURL GetDocumentURLForInstance(PP_Instance instance) = 0;
   virtual GURL GetPluginURLForInstance(PP_Instance instance) = 0;
+
+  // Set callback used when the plugin transitions in or out of an idle state.

[dmichael (off chromium), 2013/11/15 18:26:22]

nit: This comment could be a little clearer.

"Sets a callback that the BrowserPpapiHost will invoke when the plugin
transitions in or out of an idle state."

[scheib, 2013/12/11 21:35:40]

Done.

+  virtual void SetOnIdleChangeCallback(const OnIdleChangeCallback callback) = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_BROWSER_PPAPI_HOST_H_