[TaskManager] Allow a Task to mutate its PID after creation

chrome/browser/task_manager/task_manager_browsertest_util.cc

Index: chrome/browser/task_manager/task_manager_browsertest_util.cc
diff --git a/chrome/browser/task_manager/task_manager_browsertest_util.cc b/chrome/browser/task_manager/task_manager_browsertest_util.cc
index 5da52d10eb02bcfd479b8d3d5503ec245fe8f0d3..91ea136dac37a7a643f0e6de0b13b0919cc16693 100644
--- a/chrome/browser/task_manager/task_manager_browsertest_util.cc
+++ b/chrome/browser/task_manager/task_manager_browsertest_util.cc
@@ -106,6 +106,10 @@ class ResourceChangeObserver {
     switch (column_specifier_) {
       case ColumnSpecifier::COLUMN_NONE:
         return "N/A";
+      case ColumnSpecifier::PROCESS_ID:
+        return "Process ID";
+      case ColumnSpecifier::PHYSICAL_MEMORY:
+        return "Physical Memory";
       case ColumnSpecifier::V8_MEMORY:
         return "V8 Memory";
       case ColumnSpecifier::V8_MEMORY_USED: