Consistently use notifications from component updater w/ on-demand PNaCl.

chrome/browser/component_updater/component_updater_service.h

Index: chrome/browser/component_updater/component_updater_service.h
diff --git a/chrome/browser/component_updater/component_updater_service.h b/chrome/browser/component_updater/component_updater_service.h
index c0975454efa6fe5103d25b403163692801e25230..907fd7d11d6bac87092317549690f38dcac1473d 100644
--- a/chrome/browser/component_updater/component_updater_service.h
+++ b/chrome/browser/component_updater/component_updater_service.h
@@ -20,6 +20,10 @@ class DictionaryValue;
 class FilePath;
 }
 
+namespace content {
+class NotificationSource;
+}
+
 class ComponentPatcher;
 
 // Component specific installers must derive from this class and implement
@@ -156,6 +160,12 @@ class ComponentUpdateService {
   // via the Install() hook.
   virtual Status CheckForUpdateSoon(const CrxComponent& component) = 0;
 
+  // Return true if a NOTIFICATION_COMPONENT_UPDATE_FOUND or
+  // NOTIFICATION_COMPONENT_UPDATE_READY is for the given component.
+  virtual bool IsUpdateNotificationForComponent(
+      const content::NotificationSource& src,
+      const CrxComponent& component) = 0;
+
   virtual ~ComponentUpdateService() {}
 };