Fix some issues with extension messaging for transient pages.

- Calling sendResponse within an onMessage listener no longer throws an error.
- Sending a message to a transient page that is only partially loaded no longer
fails.

BUG=120531
TEST=no

Review URL: https://chromiumcodereview.appspot.com/9968068

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@130417 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 5 insertions, 0 deletions

diff --git a/chrome/browser/extensions/lazy_background_task_queue.h b/chrome/browser/extensions/lazy_background_task_queue.h
index 63936b6..0f4c830 100644
--- a/chrome/browser/extensions/lazy_background_task_queue.h
+++ b/chrome/browser/extensions/lazy_background_task_queue.h
@@ -15,6 +15,7 @@
 #include "content/public/browser/notification_observer.h"
 #include "content/public/browser/notification_registrar.h"
 
+class Extension;
 class ExtensionHost;
 class Profile;
 
@@ -31,6 +32,10 @@ class LazyBackgroundTaskQueue : public content::NotificationObserver {
   explicit LazyBackgroundTaskQueue(Profile* profile);
   virtual ~LazyBackgroundTaskQueue();
 
+  // Returns true if the task should be added to the queue (that is, if the
+  // extension has a lazy background page that isn't ready yet).
+  bool ShouldEnqueueTask(Profile* profile, const Extension* extension);
+
   // Adds a task to the queue for a given extension. If this is the first
   // task added for the extension, its lazy background page will be loaded.
   void AddPendingTask(