Add a "Keepalive count" column to Task Manager.

chrome/browser/task_manager/providers/task.h

 // 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.
 
 #ifndef CHROME_BROWSER_TASK_MANAGER_PROVIDERS_TASK_H_
 #define CHROME_BROWSER_TASK_MANAGER_PROVIDERS_TASK_H_
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 117 matching lines @@
   // Check for whether the task reports it or not first.
   bool ReportsV8Memory() const;
   virtual int64_t GetV8MemoryAllocated() const;
   virtual int64_t GetV8MemoryUsed() const;
 
   // Checking if the task reports Webkit resource cache statistics and getting
   // them if it does.
   virtual bool ReportsWebCacheStats() const;
   virtual blink::WebCache::ResourceTypeStats GetWebCacheStats() const;
 
+  // Returns the keep-alive counter if the Task is an event page, -1 otherwise.
+  virtual int GetKeepaliveCount() const;
+
   // Checking whether the task reports network usage.
   bool ReportsNetworkUsage() const;
 
   int64_t task_id() const { return task_id_; }
   int64_t network_usage() const { return network_usage_; }
   const base::string16& title() const { return title_; }
   const std::string& rappor_sample_name() const { return rappor_sample_name_; }
   const gfx::ImageSkia& icon() const { return icon_; }
   const base::ProcessHandle& process_handle() const { return process_handle_; }
   const base::ProcessId& process_id() const { return process_id_; }
@@ skipping 33 matching lines @@
 
   // The PID of the process on which this task is running.
   const base::ProcessId process_id_;
 
   DISALLOW_COPY_AND_ASSIGN(Task);
 };
 
 }  // namespace task_manager
 
 #endif  // CHROME_BROWSER_TASK_MANAGER_PROVIDERS_TASK_H_