Improve per-process CPU report

When there is only one process of a particular type it doesn't make
sense to list the context switches and CPU usage both for the total and
for the (one) process. This change makes it so that the information is
omitted for the line where the PID is listed. This makes many reports
much less cluttered.

bin/IdentifyChromeProcesses.py

@@ -197,10 +197,11 @@ def main():
             context_switches += context_switches_by_pid[pid]
             cpu_usage += cpu_usage_by_pid[pid]
         print("total - %6d context switches, %8.2f ms CPU" % (context_switches, cpu_usage), end="")
-      for pid in pidsByType[type]:
+      list_by_type = pidsByType[type]
+      for pid in list_by_type:
         if show_cpu_usage:
           print("\r\n        ", end="")
-          if pid in cpu_usage_by_pid:
+          if pid in cpu_usage_by_pid and len(list_by_type) > 1: # Skip per-process details if there's only one.:
             print("%5d - %6d context switches, %8.2f ms CPU" % (pid, context_switches_by_pid[pid], cpu_usage_by_pid[pid]), end="")
           else:
             print("%5d" % pid, end="")