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

chrome/browser/component_updater/component_updater_service.h

 // Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
 #define CHROME_BROWSER_COMPONENT_UPDATER_COMPONENT_UPDATER_SERVICE_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 95 matching lines @@
   ComponentInstaller* installer;
   ComponentObserver* observer;
   Version version;
   std::string fingerprint;
   std::string name;
   bool allow_background_download;
   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
 // instances of CrxComponent registered using RegisterComponent(). On the
 // server, each component is packaged as a CRX which is the same format used
 // to package extensions. To the update service each component is identified
 // by its public key hash (CrxComponent::pk_hash). If there is an update
 // available and its version is bigger than (CrxComponent::version), it will
 // be downloaded, verified and unpacked. Then component-specific installer
 // ComponentInstaller::Install (of CrxComponent::installer) will be called.
@@ skipping 60 matching lines @@
   // will not be canceled.
   virtual Status Stop() = 0;
 
   // Add component to be checked for updates. You can call this method
   // before calling Start().
   virtual Status RegisterComponent(const CrxComponent& component) = 0;
 
   // 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.
   virtual content::ResourceThrottle* GetOnDemandResourceThrottle(
       net::URLRequest* request, const std::string& crx_id) = 0;
 
   virtual ~ComponentUpdateService() {}
 
   friend class ::ComponentsUI;
   friend class OnDemandTester;
 
  private:
   // Ask the component updater to do an update check for a previously
   // registered component, immediately. If an update or check is already
   // in progress, returns |kInProgress|.
   // There is no guarantee that the item will actually be updated,
   // since an update may not be available. Listeners for the component will
   // know the outcome of the check.
   virtual Status OnDemandUpdate(const std::string& component_id) = 0;
 };
 
 // Creates the component updater. You must pass a valid |config| allocated on
 // the heap which the component updater will own.
 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_