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

components/nacl/browser/nacl_browser_delegate.h

Index: components/nacl/browser/nacl_browser_delegate.h
diff --git a/components/nacl/browser/nacl_browser_delegate.h b/components/nacl/browser/nacl_browser_delegate.h
index 0540f60d10997a8f24cf23eb419e60094987272f..a0313473eedbb4b510004e27cf8c4f7fb66abec9 100644
--- a/components/nacl/browser/nacl_browser_delegate.h
+++ b/components/nacl/browser/nacl_browser_delegate.h
@@ -8,6 +8,8 @@
 #include <string>
 
 #include "base/callback_forward.h"
+// Included because nested OnKeepaliveCallback class can't be forward declared.

[yzshen1, 2013/12/13 21:23:15]

nit: might be okay to remove this comment because this happens quite often.
(optional)

[scheib, 2013/12/14 00:07:41]

Done.

+#include "content/public/browser/browser_ppapi_host.h"
 
 class GURL;
 
@@ -21,10 +23,6 @@ class HostFactory;
 }
 }
 
-namespace content {
-class BrowserPpapiHost;
-}
-
 // Encapsulates the dependencies of NaCl code on chrome/, to avoid a direct
 // dependency on chrome/.
 class NaClBrowserDelegate {
@@ -73,6 +71,10 @@ class NaClBrowserDelegate {
 
   // Returns whether NaCl application with this manifest URL should be debugged.
   virtual bool URLMatchesDebugPatterns(const GURL& manifest_url) = 0;
+
+  // Returns a callback that handles NaCl idle state transitions.
+  virtual content::BrowserPpapiHost::OnKeepaliveCallback
+      GetOnKeepaliveCallback() = 0;
 };
 
 #endif  // COMPONENTS_NACL_BROWSER_NACL_BROWSER_DELEGATE_H_