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

chrome/browser/ui/webui/components_ui.h

Index: chrome/browser/ui/webui/components_ui.h
diff --git a/chrome/browser/ui/webui/components_ui.h b/chrome/browser/ui/webui/components_ui.h
index 2e98f211a2070adcbef2c7ba29035aa0626a19f1..0a234c99a7014aa21198b72d6ca4505fa362aa12 100644
--- a/chrome/browser/ui/webui/components_ui.h
+++ b/chrome/browser/ui/webui/components_ui.h
@@ -5,6 +5,8 @@
 #ifndef CHROME_BROWSER_UI_WEBUI_COMPONENTS_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_COMPONENTS_UI_H_
 
+#include "chrome/browser/component_updater/component_updater_service.h"
+#include "chrome/browser/component_updater/crx_update_item.h"
 #include "content/public/browser/web_ui_controller.h"
 #include "ui/base/layout.h"
 
@@ -16,16 +18,27 @@ namespace user_prefs {
 class PrefRegistrySyncable;
 }
 
-class ComponentsUI : public content::WebUIController {
+class ComponentsUI : public content::WebUIController,
+                     public component_updater::ServiceObserver {
  public:
   explicit ComponentsUI(content::WebUI* web_ui);
+  ~ComponentsUI();
 
   static void OnDemandUpdate(const std::string& component_id);
 
+  static base::ListValue* LoadComponents();
+
   static base::RefCountedMemory* GetFaviconResourceBytes(
       ui::ScaleFactor scale_factor);
 
+  // Override from ServiceObserver
+  virtual void OnEvent(Events event, const std::string& id) OVERRIDE;
+
  private:
+  static void ComponentEventToString(Events event,

[Sorin Jianu, 2014/05/16 16:36:09]

We could return a std::string just like the similar function @40 does.

[Shrikant Kelkar, 2014/05/16 18:58:56]

Done.

+                                     std::string* converted_event);

[Sorin Jianu, 2014/05/16 16:36:09]

We need to rename |converted_event| here as well to match the name in the
function definition.

[Shrikant Kelkar, 2014/05/16 18:58:56]

Modified to return string.

+  static std::string ServiceStatusToString(
+            component_updater::CrxUpdateItem::Status status);
   DISALLOW_COPY_AND_ASSIGN(ComponentsUI);
 };