Fix various TaskManager bugs and add new enhancements

chrome/browser/task_management/sampling/task_group.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_GROUP_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_GROUP_H_
 
 #include <map>
 
 #include "base/memory/weak_ptr.h"
@@ skipping 36 matching lines @@
 
   size_t num_tasks() const { return tasks_.size(); }
   bool empty() const { return tasks_.empty(); }
 
   double cpu_usage() const { return cpu_usage_; }
   int64 private_bytes() const { return memory_usage_.private_bytes; }
   int64 shared_bytes() const { return memory_usage_.shared_bytes; }
   int64 physical_bytes() const { return memory_usage_.physical_bytes; }
   int64 gpu_memory() const { return gpu_memory_; }
   bool gpu_memory_has_duplicates() const { return gpu_memory_has_duplicates_; }
+  int64 per_process_network_usage() const { return per_process_network_usage_; }
 
 #if defined(OS_WIN)
   int64 gdi_current_handles() const { return gdi_current_handles_; }
   int64 gdi_peak_handles() const { return gdi_peak_handles_; }
   int64 user_current_handles() const { return user_current_handles_; }
   int64 user_peak_handles() const { return user_peak_handles_; }
 #endif  // defined(OS_WIN)
 
 #if !defined(DISABLE_NACL)
   int nacl_debug_stub_port() const { return nacl_debug_stub_port_; }
@@ skipping 23 matching lines @@
   scoped_refptr<TaskGroupSampler> worker_thread_sampler_;
 
   // Maps the Tasks by their IDs.
   // Tasks are not owned by the TaskGroup. They're owned by the TaskProviders.
   std::map<TaskId, Task*> tasks_;
 
   // The per process resources usages.
   double cpu_usage_;
   MemoryUsageStats memory_usage_;
   int64 gpu_memory_;
+  // The network usage in bytes per second as the sum of all network usages of
+  // the individual tasks sharing the same process.
+  int64 per_process_network_usage_;
 #if defined(OS_WIN)
   // Windows GDI and USER Handles.
   int64 gdi_current_handles_;
   int64 gdi_peak_handles_;
   int64 user_current_handles_;
   int64 user_peak_handles_;
 #endif  // defined(OS_WIN)
 #if !defined(DISABLE_NACL)
   int nacl_debug_stub_port_;
 #endif  // !defined(DISABLE_NACL)
   int idle_wakeups_per_second_;
   bool gpu_memory_has_duplicates_;
 
   // Always keep this the last member of this class so that it's the first to be
   // destroyed.
   base::WeakPtrFactory<TaskGroup> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskGroup);
 };
 
 }  // namespace task_management
 
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_SAMPLING_TASK_GROUP_H_