Make extensions visible in the Task Manager.

- register for notifications when extension hosts are created/destroyed
- collapse extension tabs into just one table row, also for tabs opened while the task manager stays open

TEST=Start chrome.exe with --enable-extensions. Install the buildbot monitor extension. Open the task manager. You should see an extension process.

http://crbug.com/12127

Review URL: http://codereview.chromium.org/125047

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@18352 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 11 insertions, 1 deletions

diff --git a/chrome/browser/task_manager_resource_providers.h b/chrome/browser/task_manager_resource_providers.h
index a5ee44d..e9640f0 100644
--- a/chrome/browser/task_manager_resource_providers.h
+++ b/chrome/browser/task_manager_resource_providers.h
@@ -205,7 +205,8 @@ class TaskManagerExtensionProcessResource : public TaskManager::Resource {
 };
 
 class TaskManagerExtensionProcessResourceProvider
-    : public TaskManager::ResourceProvider {
+    : public TaskManager::ResourceProvider,
+      public NotificationObserver {
  public:
   explicit TaskManagerExtensionProcessResourceProvider(
       TaskManager* task_manager);
@@ -217,8 +218,14 @@ class TaskManagerExtensionProcessResourceProvider
   virtual void StartUpdating();
   virtual void StopUpdating();
 
+  // NotificationObserver method:
+  virtual void Observe(NotificationType type,
+                       const NotificationSource& source,
+                       const NotificationDetails& details);
+
  private:
   void AddToTaskManager(ExtensionHost* extension_host);
+  void RemoveFromTaskManager(ExtensionHost* extension_host);
 
   TaskManager* task_manager_;
 
@@ -229,6 +236,9 @@ class TaskManagerExtensionProcessResourceProvider
   // byte read notifications).
   std::map<int, TaskManagerExtensionProcessResource*> pid_to_resources_;
 
+  // A scoped container for notification registries.
+  NotificationRegistrar registrar_;
+
   bool updating_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerExtensionProcessResourceProvider);