Fix various TaskManager bugs and add new enhancements

chrome/browser/task_management/task_manager_observer_unittest.cc

 // 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.
 
 #include "base/timer/mock_timer.h"
 #include "chrome/browser/task_management/task_manager_interface.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace task_management {
 
@@ skipping 40 matching lines @@
   }
   const gfx::ImageSkia& GetIcon(TaskId task_id) const override { return icon_; }
   const base::ProcessHandle& GetProcessHandle(TaskId task_id) const override {
     return handle_;
   }
   const base::ProcessId& GetProcessId(TaskId task_id) const override {
     return id_;
   }
   Task::Type GetType(TaskId task_id) const override { return Task::UNKNOWN; }
   int64 GetNetworkUsage(TaskId task_id) const override { return -1; }
+  int64 GetProcessTotalNetworkUsage(TaskId task_id) const override {
+    return -1;
+  }
   int64 GetSqliteMemoryUsed(TaskId task_id) const override { return -1; }
   bool GetV8Memory(TaskId task_id,
                    int64* allocated,
                    int64* used) const override { return false; }
   bool GetWebCacheStats(
       TaskId task_id,
       blink::WebCache::ResourceTypeStats* stats) const override {
     return false;
   }
   const TaskIdList& GetTaskIdsList() const override {
@@ skipping 126 matching lines @@
   EXPECT_EQ(flags1 | flags2, task_manager().GetEnabledFlags());
   task_manager().RemoveObserver(&observer2);
   EXPECT_EQ(refresh_time1, task_manager().GetRefreshTime());
   EXPECT_EQ(flags1, task_manager().GetEnabledFlags());
   task_manager().RemoveObserver(&observer1);
   EXPECT_EQ(base::TimeDelta::Max(), task_manager().GetRefreshTime());
   EXPECT_EQ(0, task_manager().GetEnabledFlags());
 }
 
 }  // namespace task_management