Add a "Keepalive count" column to Task Manager.

chrome/browser/task_manager/providers/web_contents/extension_task.cc

 // Copyright 2015 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.
 
 #include "chrome/browser/task_manager/providers/web_contents/extension_task.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_finder.h"
@@ skipping 28 matching lines @@
 }
 
 }  // namespace
 
 ExtensionTask::ExtensionTask(content::WebContents* web_contents,
                              const extensions::Extension* extension,
                              extensions::ViewType view_type)
     : RendererTask(GetExtensionTitle(web_contents, extension, view_type),
                    GetDefaultIcon(),
                    web_contents,
-                   web_contents->GetRenderProcessHost()) {
+                   web_contents->GetRenderProcessHost()),
+      view_type_(view_type) {
   LoadExtensionIcon(extension);
 }
 
 ExtensionTask::~ExtensionTask() {
 }
 
 void ExtensionTask::UpdateTitle() {
   // The title of the extension should not change as a result of title change
   // in its WebContents, so we ignore this.
 }
@@ skipping 26 matching lines @@
   if (!browser)
     return;
 
   chrome::ShowExtensions(browser, extension->id());
 }
 
 Task::Type ExtensionTask::GetType() const {
   return Task::EXTENSION;
 }
 
+int ExtensionTask::GetKeepaliveCount() const {
+  if (view_type_ != extensions::VIEW_TYPE_EXTENSION_BACKGROUND_PAGE)
+    return -1;
+
+  const extensions::Extension* extension =
+      extensions::ProcessManager::Get(web_contents()->GetBrowserContext())
+          ->GetExtensionForWebContents(web_contents());
+  if (!extension)
+    return -1;
+
+  return extensions::ProcessManager::Get(web_contents()->GetBrowserContext())
+      ->GetLazyKeepaliveCount(extension);
+}
+
 void ExtensionTask::OnExtensionIconImageChanged(extensions::IconImage* image) {
   DCHECK_EQ(extension_icon_.get(), image);
 
   if (!image->image_skia().isNull())
     set_icon(image->image_skia());
 }
 
 base::string16 ExtensionTask::GetExtensionTitle(
     content::WebContents* web_contents,
     const extensions::Extension* extension,
@@ skipping 26 matching lines @@
                                 extension_misc::EXTENSION_ICON_SMALL,
                                 icon(),
                                 this));
 
   // Triggers actual image loading with 1x resources.
   extension_icon_->image_skia().GetRepresentation(1.0f);
   set_icon(extension_icon_->image_skia());
 }
 
 }  // namespace task_manager