Fix various TaskManager bugs and add new enhancements

chrome/browser/task_management/sampling/task_manager_impl.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_MANAGEMENT_SAMPLING_TASK_MANAGER_IMPL_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_MANAGER_IMPL_H_
 
 #include <map>
 
 #include "base/lazy_instance.h"
@@ skipping 33 matching lines @@
   void GetUSERHandles(TaskId task_id,
                       int64* current,
                       int64* peak) const override;
   const base::string16& GetTitle(TaskId task_id) const override;
   base::string16 GetProfileName(TaskId task_id) const override;
   const gfx::ImageSkia& GetIcon(TaskId task_id) const override;
   const base::ProcessHandle& GetProcessHandle(TaskId task_id) const override;
   const base::ProcessId& GetProcessId(TaskId task_id) const override;
   Task::Type GetType(TaskId task_id) const override;
   int64 GetNetworkUsage(TaskId task_id) const override;
+  int64 GetProcessTotalNetworkUsage(TaskId task_id) const override;
   int64 GetSqliteMemoryUsed(TaskId task_id) const override;
   bool GetV8Memory(TaskId task_id,
                    int64* allocated,
                    int64* used) const override;
   bool GetWebCacheStats(
       TaskId task_id,
       blink::WebCache::ResourceTypeStats* stats) const override;
   const TaskIdList& GetTaskIdsList() const override;
   size_t GetNumberOfTasksOnSameProcess(TaskId task_id) const override;
 
@@ skipping 61 matching lines @@
   // This will be set to true while there are observers and the task manager is
   // running.
   bool is_running_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerImpl);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_MANAGER_IMPL_H_