WebUI TaskManager: make it default on Chrome OS

chrome/browser/ui/webui/task_manager_handler.cc

Index: chrome/browser/ui/webui/task_manager_handler.cc
diff --git a/chrome/browser/ui/webui/task_manager_handler.cc b/chrome/browser/ui/webui/task_manager_handler.cc
index dd5ac7f7cc37c8ff855e831b50682e1f69a18132..03c90dd2acc108647e8728d88e17d26c7f7169be 100644
--- a/chrome/browser/ui/webui/task_manager_handler.cc
+++ b/chrome/browser/ui/webui/task_manager_handler.cc
@@ -11,6 +11,9 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/task_manager/task_manager.h"
 #include "chrome/browser/ui/webui/web_ui_util.h"
+#include "chrome/common/chrome_notification_types.h"
+#include "content/common/notification_service.h"
+#include "content/common/notification_source.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 
 namespace {
@@ -244,6 +247,10 @@ void TaskManagerHandler::OnItemsAdded(const int start, const int length) {
 }
 
 void TaskManagerHandler::OnItemsRemoved(const int start, const int length) {
+  // Returns if this is called before updating |resource_to_group_table_|.
+  if (resource_to_group_table_.size() < static_cast<size_t>(start + length))
+    return;
+
   // Converts from an index of resources to an index of groups.
   int group_start = resource_to_group_table_[start];
   int group_end = resource_to_group_table_[start + length - 1];
@@ -332,6 +339,11 @@ void TaskManagerHandler::EnableTaskManager(const ListValue* indexes) {
   is_enabled_ = true;
   model_->AddObserver(this);
   model_->StartUpdating();
+
+  NotificationService::current()->Notify(
+      chrome::NOTIFICATION_TASK_MANAGER_WINDOW_READY,
+      Source<TaskManagerModel>(model_),
+      NotificationService::NoDetails());
 }
 
 void TaskManagerHandler::OpenAboutMemory(const ListValue* indexes) {