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

chrome/browser/ui/webui/components_ui.cc

Index: chrome/browser/ui/webui/components_ui.cc
diff --git a/chrome/browser/ui/webui/components_ui.cc b/chrome/browser/ui/webui/components_ui.cc
index e5cce27f49a3874dd03e8144820f3d736545d4e2..276f8e39c2505070a4284e00b0a41feb33809aa8 100644
--- a/chrome/browser/ui/webui/components_ui.cc
+++ b/chrome/browser/ui/webui/components_ui.cc
@@ -76,6 +76,8 @@ class ComponentsDOMHandler : public WebUIMessageHandler {
 
  private:
   void LoadComponents();
+  void ComponentsDOMHandler::HandleRequestComponentStatus(
+      const base::ListValue* args);
 
   content::NotificationRegistrar registrar_;
 
@@ -93,6 +95,10 @@ void ComponentsDOMHandler::RegisterMessages() {
   web_ui()->RegisterMessageCallback("checkUpdate",
       base::Bind(&ComponentsDOMHandler::HandleCheckUpdate,
                  base::Unretained(this)));
+
+  web_ui()->RegisterMessageCallback("requestComponentStatus",
+      base::Bind(&ComponentsDOMHandler::HandleRequestComponentStatus,
+                 base::Unretained(this)));
 }
 
 void ComponentsDOMHandler::HandleRequestComponentsData(
@@ -119,6 +125,37 @@ void ComponentsDOMHandler::HandleCheckUpdate(const base::ListValue* args) {
   ComponentsUI::OnDemandUpdate(component_id);
 }
 
+void ComponentsDOMHandler::HandleRequestComponentStatus(
+    const base::ListValue* args) {
+  if (args->GetSize() != 1) {
+    NOTREACHED();
+    return;
+  }
+
+  std::string component_id;
+  if (!args->GetString(0, &component_id)) {
+    NOTREACHED();
+    return;
+  }
+
+  component_updater::ComponentUpdateService* cus =
+      g_browser_process->component_updater();
+  component_updater::ComponentUpdateService::Status status =
+      cus->GetComponentStatus(component_id);
+
+  std::string string_status;
+  if (status == component_updater::ComponentUpdateService::kInProgress)
+    string_status = "in-progress";
+  else if (status == component_updater::ComponentUpdateService::kOk)
+    string_status = "ok";
+  else
+    string_status = "error";
+
+  web_ui()->CallJavascriptFunction("returnComponentStatus",
+                                   base::StringValue(component_id),
+                                   base::StringValue(string_status));
+}
+
 void ComponentsDOMHandler::LoadComponents() {
   component_updater::ComponentUpdateService* cus =
       g_browser_process->component_updater();
@@ -134,6 +171,17 @@ void ComponentsDOMHandler::LoadComponents() {
     component_entry->SetString("id", component.id);
     component_entry->SetString("name", component.name);
     component_entry->SetString("version", component.version);
+    switch (component.status) {
+      case component_updater::ComponentUpdateService::kInProgress:
+        component_entry->SetString("status", "in-progress");
+        break;
+      case component_updater::ComponentUpdateService::kOk:
+        component_entry->SetString("status", "ok");
+        break;
+      case component_updater::ComponentUpdateService::kError:
+        component_entry->SetString("status", "error");
+        break;
+    }
 
     component_list->Append(component_entry);
   }