Restore "Add current rss and embedder name to Observatory"

runtime/vm/os_linux.cc

Index: runtime/vm/os_linux.cc
diff --git a/runtime/vm/os_linux.cc b/runtime/vm/os_linux.cc
index ccbc7e51e4f07abe06506e8e625c7e1bb01f1903..3722ff077606097b88b62bfb1d0f928f13c56b1a 100644
--- a/runtime/vm/os_linux.cc
+++ b/runtime/vm/os_linux.cc
@@ -221,14 +221,6 @@ int OS::NumberOfAvailableProcessors() {
   return sysconf(_SC_NPROCESSORS_ONLN);
 }
 
-uintptr_t OS::MaxRSS() {
-  struct rusage usage;
-  usage.ru_maxrss = 0;
-  int r = getrusage(RUSAGE_SELF, &usage);
-  ASSERT(r == 0);
-  return usage.ru_maxrss * KB;
-}
-
 void OS::Sleep(int64_t millis) {
   int64_t micros = millis * kMicrosecondsPerMillisecond;
   SleepMicros(micros);