plumb network upload into the task manager

chrome/browser/task_manager/sampling/task_group.h

Index: chrome/browser/task_manager/sampling/task_group.h
diff --git a/chrome/browser/task_manager/sampling/task_group.h b/chrome/browser/task_manager/sampling/task_group.h
index 7768367888b9d77d600d185910b74962ae51a828..6e84a6178a8d0abc45139d3707e935bda83efc0e 100644
--- a/chrome/browser/task_manager/sampling/task_group.h
+++ b/chrome/browser/task_manager/sampling/task_group.h
@@ -80,8 +80,11 @@ class TaskGroup {
   int64_t gpu_memory() const { return gpu_memory_; }
   bool gpu_memory_has_duplicates() const { return gpu_memory_has_duplicates_; }
   base::MemoryState memory_state() const { return memory_state_; }
-  int64_t per_process_network_usage() const {
-    return per_process_network_usage_;
+  int64_t per_process_network_usage_rate() const {
+    return per_process_network_usage_rate_;
+  }
+  int64_t cumulative_per_process_network_usage() const {
+    return cumulative_per_process_network_usage_;
   }
   bool is_backgrounded() const { return is_backgrounded_; }
 
@@ -162,7 +165,12 @@ class TaskGroup {
   base::MemoryState memory_state_;
   // The network usage in bytes per second as the sum of all network usages of
   // the individual tasks sharing the same process.
-  int64_t per_process_network_usage_;
+  int64_t per_process_network_usage_rate_;
+
+  // A continuously updating sum of all bytes that have been downloaded and
+  // uploaded by all tasks in this process.
+  int64_t cumulative_per_process_network_usage_;
+
 #if defined(OS_WIN)
   // Windows GDI and USER Handles.
   int64_t gdi_current_handles_;