Restore "Add current rss and embedder name to Observatory"

runtime/vm/metrics.h

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_METRICS_H_
 #define RUNTIME_VM_METRICS_H_
 
 #include "vm/allocation.h"
 
 namespace dart {
@@ skipping 13 matching lines @@
   V(MetricHeapNewCapacity, HeapNewCapacity, "heap.new.capacity", kByte)        \
   V(MaxMetric, HeapNewCapacityMax, "heap.new.capacity.max", kByte)             \
   V(MetricHeapNewExternal, HeapNewExternal, "heap.new.external", kByte)        \
   V(MetricHeapUsed, HeapGlobalUsed, "heap.global.used", kByte)                 \
   V(MaxMetric, HeapGlobalUsedMax, "heap.global.used.max", kByte)               \
   V(Metric, RunnableLatency, "isolate.runnable.latency", kMicrosecond)         \
   V(Metric, RunnableHeapSize, "isolate.runnable.heap", kByte)
 
 #define VM_METRIC_LIST(V)                                                      \
   V(MetricIsolateCount, IsolateCount, "vm.isolate.count", kCounter)            \
+  V(MetricCurrentRSS, CurrentRSS, "vm.memory.current", kByte)                  \
   V(MetricPeakRSS, PeakRSS, "vm.memory.max", kByte)
 
 class Metric {
  public:
   enum Unit {
     kCounter,
     kByte,
     kMicrosecond,
   };
 
@@ skipping 111 matching lines @@
 class MetricHeapNewExternal : public Metric {
  protected:
   virtual int64_t Value() const;
 };
 
 class MetricIsolateCount : public Metric {
  protected:
   virtual int64_t Value() const;
 };
 
+class MetricCurrentRSS : public Metric {
+ protected:
+  virtual int64_t Value() const;
+};
+
 class MetricPeakRSS : public Metric {
  protected:
   virtual int64_t Value() const;
 };
 
 class MetricHeapUsed : public Metric {
  protected:
   virtual int64_t Value() const;
 };
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_METRICS_H_