Add process start time and CPU time columns to 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 9d7f76e1b2cb2e4815649a86748f0ac1d95f6c14..288c54f35e7581e0e50ab13701473220117d673c 100644
--- a/chrome/browser/task_manager/sampling/task_group.h
+++ b/chrome/browser/task_manager/sampling/task_group.h
@@ -15,6 +15,7 @@
 #include "base/memory/memory_coordinator_client.h"
 #include "base/memory/weak_ptr.h"
 #include "base/process/process_handle.h"
+#include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/task_manager/providers/task.h"
 #include "chrome/browser/task_manager/sampling/task_group_sampler.h"
@@ -68,6 +69,8 @@ class TaskGroup {
   bool empty() const { return tasks().empty(); }
 
   double cpu_usage() const { return cpu_usage_; }
+  base::Time start_time() const { return start_time_; }
+  base::TimeDelta cpu_time() const { return cpu_time_; }
   int64_t private_bytes() const { return memory_usage_.private_bytes; }
   int64_t shared_bytes() const { return memory_usage_.shared_bytes; }
   int64_t physical_bytes() const { return memory_usage_.physical_bytes; }
@@ -109,6 +112,10 @@ class TaskGroup {
 
   void OnCpuRefreshDone(double cpu_usage);
 
+  void OnStartTimeRefreshDone(base::Time start_time);
+
+  void OnCpuTimeRefreshDone(base::TimeDelta cpu_time);
+
   void OnPhysicalMemoryUsageRefreshDone(int64_t physical_bytes);
   void OnMemoryUsageRefreshDone(MemoryUsageStats memory_usage);
 
@@ -145,6 +152,8 @@ class TaskGroup {
 
   // The per process resources usages.
   double cpu_usage_;
+  base::Time start_time_;     // Only calculated On Windows now.
+  base::TimeDelta cpu_time_;  // Only calculated On Windows now.
   MemoryUsageStats memory_usage_;
   int64_t gpu_memory_;
   base::MemoryState memory_state_;