Add process start time and CPU time columns to task manager

chrome/browser/task_manager/sampling/task_manager_impl.cc

Index: chrome/browser/task_manager/sampling/task_manager_impl.cc
diff --git a/chrome/browser/task_manager/sampling/task_manager_impl.cc b/chrome/browser/task_manager/sampling/task_manager_impl.cc
index 8d12ca5a5bd60b042b9e5627c9f17cc5e8c4200a..25d94c9af25505d2b7229f55a377c14f7ab320f0 100644
--- a/chrome/browser/task_manager/sampling/task_manager_impl.cc
+++ b/chrome/browser/task_manager/sampling/task_manager_impl.cc
@@ -10,6 +10,7 @@
 #include <unordered_set>
 #include <vector>
 
+#include "base/bit_cast.h"
 #include "base/command_line.h"
 #include "base/containers/adapters.h"
 #include "build/build_config.h"
@@ -93,6 +94,29 @@ double TaskManagerImpl::GetCpuUsage(TaskId task_id) const {
   return GetTaskGroupByTaskId(task_id)->cpu_usage();
 }
 
+base::Time TaskManagerImpl::GetStartTime(TaskId task_id) const {
+#if defined(OS_WIN)
+  int64_t time_in_100ns = GetTaskGroupByTaskId(task_id)->start_time();

[stanisc, 2016/12/19 22:44:10]

time_in_100ns is *ticks*

[chengx, 2016/12/20 00:51:12]

Cool. Good to know!

[brucedawson, 2016/12/20 01:27:57]

Well, Microsoft also refers to a 1 ms interval as a tick (GetTickCount()) so I
wouldn't use that nomenclature.

+  if (time_in_100ns < 0)

[brucedawson, 2016/12/19 21:51:05]

If you do change to unsigned type then this check will have to be for == 0.

[chengx, 2016/12/20 00:51:12]

Done.

+    return base::Time();
+  FILETIME ft = bit_cast<FILETIME, int64_t>(time_in_100ns);
+  return base::Time::FromFileTime(ft);
+#else
+  return base::Time();
+#endif
+}
+
+base::TimeDelta TaskManagerImpl::GetCpuTime(TaskId task_id) const {
+#if defined(OS_WIN)
+  int64_t time_in_100ns = GetTaskGroupByTaskId(task_id)->cpu_time();
+  if (time_in_100ns < 0)
+    return base::TimeDelta();
+  return base::TimeDelta::FromMicroseconds(time_in_100ns / 10);
+#else
+  return base::TimeDelta();
+#endif
+}
+
 int64_t TaskManagerImpl::GetPhysicalMemoryUsage(TaskId task_id) const {
   return GetTaskGroupByTaskId(task_id)->physical_bytes();
 }