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

content/public/browser/browser_ppapi_host.h

Index: content/public/browser/browser_ppapi_host.h
diff --git a/content/public/browser/browser_ppapi_host.h b/content/public/browser/browser_ppapi_host.h
index 45f997ea06b7705f62594948466ffcecab9cbb83..f7625c9b08aeec5d3b8915f7e2c771cc1ab893e1 100644
--- a/content/public/browser/browser_ppapi_host.h
+++ b/content/public/browser/browser_ppapi_host.h
@@ -34,6 +34,18 @@ namespace content {
 // 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(
@@ -81,6 +93,9 @@ class CONTENT_EXPORT BrowserPpapiHost {
   // 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