Fix various TaskManager bugs and add new enhancements

chrome/browser/task_management/task_manager_interface.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_TASK_MANAGER_INTERFACE_H_
 #define CHROME_BROWSER_TASK_MANAGEMENT_TASK_MANAGER_INTERFACE_H_
 
 #include <stdint.h>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 48 matching lines @@
   // of -1 means no valid value is currently available.
   // |has_duplicates| will be set to true if this process' GPU resource count is
   // inflated because it is counting other processes' resources.
   virtual int64 GetGpuMemoryUsage(TaskId task_id,
                                   bool* has_duplicates) const = 0;
 
   // Returns the number of average idle CPU wakeups per second since the last
   // refresh cycle. A value of -1 means no valid value is currently available.
   virtual int GetIdleWakeupsPerSecond(TaskId task_id) const = 0;
 
-  // Returns the NaCl GDB debug stub port. A value of -1 means no valid value is
-  // currently available.
+  // Returns the NaCl GDB debug stub port. A value of
+  // |nacl::kGdbDebugStubPortUnknown| means no valid value is currently
+  // available. A value of -2 means NaCl is not enabled for this build.
   virtual int GetNaClDebugStubPort(TaskId task_id) const = 0;
 
   // On Windows, gets the current and peak number of GDI and USER handles in
   // use. A value of -1 means no valid value is currently available.
   virtual void GetGDIHandles(TaskId task_id,
                              int64* current,
                              int64* peak) const = 0;
   virtual void GetUSERHandles(TaskId task_id,
                               int64* current,
                               int64* peak) const = 0;
@@ skipping 16 matching lines @@
 
   // Returns the type of the task with |task_id|.
   virtual Task::Type GetType(TaskId task_id) const = 0;
 
   // Returns the network usage (in bytes per second) during the current refresh
   // cycle for the task with |task_id|. A value of -1 means no valid value is
   // currently available or that task has never been notified of any network
   // usage.
   virtual int64 GetNetworkUsage(TaskId task_id) const = 0;
 
+  // Returns the total network usage (in bytes per second) during the current
+  // refresh cycle for the process on which the task with |task_id| is running.
+  // This is the sum of all the network usage of the individual tasks (that
+  // can be gotten by the above GetNetworkUsage()). A value of -1 means network
+  // usage calculation refresh is currently not available.
+  virtual int64 GetProcessTotalNetworkUsage(TaskId task_id) const = 0;
+
   // Returns the Sqlite used memory (in bytes) for the task with |task_id|.
   // A value of -1 means no valid value is currently available.
   virtual int64 GetSqliteMemoryUsed(TaskId task_id) const = 0;
 
   // Returns the allocated and used V8 memory (in bytes) for the task with
   // |task_id|. A return value of false means no valid value is currently
   // available.
   virtual bool GetV8Memory(TaskId task_id,
                            int64* allocated,
                            int64* used) const = 0;
@@ skipping 71 matching lines @@
 
   // The flags containing the enabled resources types calculations.
   int64 enabled_resources_flags_;
 
   DISALLOW_COPY_AND_ASSIGN(TaskManagerInterface);
 };
 
 }  // namespace task_management
 
 #endif  // CHROME_BROWSER_TASK_MANAGEMENT_TASK_MANAGER_INTERFACE_H_