Add process start time and CPU time columns to task manager

chrome/browser/task_manager/sampling/task_manager_impl.h

Index: chrome/browser/task_manager/sampling/task_manager_impl.h
diff --git a/chrome/browser/task_manager/sampling/task_manager_impl.h b/chrome/browser/task_manager/sampling/task_manager_impl.h
index eba0e8c802c7366b11add105c144b4b971fefeb6..6e9ee244082454b0495afb9df8eea8ad9a592c9c 100644
--- a/chrome/browser/task_manager/sampling/task_manager_impl.h
+++ b/chrome/browser/task_manager/sampling/task_manager_impl.h
@@ -17,6 +17,7 @@
 #include "base/macros.h"
 #include "base/memory/scoped_vector.h"
 #include "base/sequenced_task_runner.h"
+#include "base/time/time.h"
 #include "chrome/browser/task_manager/providers/task_provider.h"
 #include "chrome/browser/task_manager/providers/task_provider_observer.h"
 #include "chrome/browser/task_manager/sampling/task_group.h"
@@ -44,6 +45,8 @@ class TaskManagerImpl :
   bool IsTaskKillable(TaskId task_id) override;
   void KillTask(TaskId task_id) override;
   double GetCpuUsage(TaskId task_id) const override;
+  base::Time GetStartTime(TaskId task_id) const override;
+  base::TimeDelta GetCpuTime(TaskId task_id) const override;
   int64_t GetPhysicalMemoryUsage(TaskId task_id) const override;
   int64_t GetPrivateMemoryUsage(TaskId task_id) const override;
   int64_t GetSharedMemoryUsage(TaskId task_id) const override;