Add process start time and CPU time columns to task manager

chrome/browser/task_manager/sampling/shared_sampler_posix.cc

Index: chrome/browser/task_manager/sampling/shared_sampler_posix.cc
diff --git a/chrome/browser/task_manager/sampling/shared_sampler_posix.cc b/chrome/browser/task_manager/sampling/shared_sampler_posix.cc
index 722bf96a9156b1a370638256f53d178dbc519843..ac62fce92949d2b92d0d20cd29862fe199aa3572 100644
--- a/chrome/browser/task_manager/sampling/shared_sampler_posix.cc
+++ b/chrome/browser/task_manager/sampling/shared_sampler_posix.cc
@@ -18,7 +18,9 @@ int64_t SharedSampler::GetSupportedFlags() const { return 0; }
 void SharedSampler::RegisterCallbacks(
     base::ProcessId process_id,
     const OnIdleWakeupsCallback& on_idle_wakeups,
-    const OnPhysicalMemoryCallback& on_physical_memory) {}
+    const OnPhysicalMemoryCallback& on_physical_memory,
+    const OnStartTimeCallback& on_start_time,
+    const OnCpuTimeCallback& on_cpu_time) {}
 
 void SharedSampler::UnregisterCallbacks(base::ProcessId process_id) {}