Modified components ui to address concern of all the time disabled check update button.

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 fa59340a8b646a323f0adfdf28aeafbee6d9febf..7637fad8e55d5a61c5f7360f7d0ea107f40b023d 100644
--- a/chrome/browser/component_updater/component_updater_service.h
+++ b/chrome/browser/component_updater/component_updater_service.h
@@ -113,16 +113,7 @@ struct CrxComponent {
   ~CrxComponent();
 };
 
-// Convenience structure to use with component listing / enumeration.
-struct CrxComponentInfo {
-  // |id| is currently derived from |CrxComponent.pk_hash|, see rest of the
-  // class implementation for details.
-  std::string id;
-  std::string version;
-  std::string name;
-  CrxComponentInfo();
-  ~CrxComponentInfo();
-};
+struct CrxComponentInfo;
 
 // The component update service is in charge of installing or upgrading
 // select parts of chrome. Each part is called a component and managed by
@@ -203,6 +194,9 @@ class ComponentUpdateService {
   // Returns a list of registered components.
   virtual void GetComponents(std::vector<CrxComponentInfo>* components) = 0;
 
+  // Returns current status of a previously registered component.
+  virtual Status GetComponentStatus(const std::string& component_id) = 0;
+
   // Returns a network resource throttle. It means that a component will be
   // downloaded and installed before the resource is unthrottled. This is the
   // only function callable from the IO thread.
@@ -229,6 +223,18 @@ class ComponentUpdateService {
 ComponentUpdateService* ComponentUpdateServiceFactory(
     ComponentUpdateService::Configurator* config);
 
+// Convenience structure to use with component listing / enumeration.
+struct CrxComponentInfo {
+  // |id| is currently derived from |CrxComponent.pk_hash|, see rest of the
+  // class implementation for details.
+  std::string id;
+  std::string version;
+  std::string name;
+  ComponentUpdateService::Status status;
+  CrxComponentInfo();
+  ~CrxComponentInfo();
+};
+
 }  // namespace component_updater
 
 #endif  // CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_