Fixed missing method referenced when MallocHooks is unsupported.

runtime/observatory/lib/src/repositories/sample_profile.dart

Index: runtime/observatory/lib/src/repositories/sample_profile.dart
diff --git a/runtime/observatory/lib/src/repositories/sample_profile.dart b/runtime/observatory/lib/src/repositories/sample_profile.dart
index 5ad82824a65d5b4a86fb8581e7706ec7201249cc..f98e0159d8b02f5003ebc86ce28cc4610dfc7612 100644
--- a/runtime/observatory/lib/src/repositories/sample_profile.dart
+++ b/runtime/observatory/lib/src/repositories/sample_profile.dart
@@ -32,10 +32,11 @@ class SampleProfileLoadingProgress extends M.SampleProfileLoadingProgress {
   Stream<SampleProfileLoadingProgressEvent> get onProgress =>
       _onProgress.stream;
 
-  final S.Isolate isolate;
+  final ServiceObjectOwner owner;
   final S.Class cls;
   final M.SampleProfileTag tag;
   final bool clear;
+  final M.SampleProfileType type;
 
   M.SampleProfileLoadingStatus _status = M.SampleProfileLoadingStatus.fetching;
   double _progress = 0.0;
@@ -49,21 +50,32 @@ class SampleProfileLoadingProgress extends M.SampleProfileLoadingProgress {
   Duration get loadingTime => _loadingTime.elapsed;
   CpuProfile get profile => _profile;
 
-  SampleProfileLoadingProgress(this.isolate, this.tag, this.clear, {this.cls}) {
+  SampleProfileLoadingProgress(this.owner, this.tag, this.clear,
+      {this.type: M.SampleProfileType.cpu, this.cls}) {
     _run();
   }
 
   Future _run() async {
     _fetchingTime.start();
     try {
-      if (clear) {
-        await isolate.invokeRpc('_clearCpuProfile', {});
+      if (clear && (type == M.SampleProfileType.cpu)) {
+        await owner.invokeRpc('_clearCpuProfile', {});
       }
 
-      final response = cls != null
-          ? await cls.getAllocationSamples(_tagToString(tag))
-          : await isolate
-              .invokeRpc('_getCpuProfile', {'tags': _tagToString(tag)});
+      var response;
+      if (type == M.SampleProfileType.cpu) {
+        response = cls != null
+            ? await cls.getAllocationSamples(_tagToString(tag))
+            : await owner
+                .invokeRpc('_getCpuProfile', {'tags': _tagToString(tag)});
+      } else if (type == M.SampleProfileType.memory) {
+        assert(owner is M.VM);
+        M.VM vm = owner as M.VM;
+        response = await owner.invokeRpc(
+            '_getNativeAllocationSamples', {'tags': _tagToString(tag)});
+      } else {
+        throw new Exception('Unknown M.SampleProfileType: $type');
+      }
 
       _fetchingTime.stop();
       _loadingTime.start();
@@ -72,7 +84,7 @@ class SampleProfileLoadingProgress extends M.SampleProfileLoadingProgress {
 
       CpuProfile profile = new CpuProfile();
 
-      Stream<double> progress = profile.loadProgress(isolate, response);
+      Stream<double> progress = profile.loadProgress(owner, response);
       progress.listen((value) {
         _progress = value;
         _triggerOnProgress();
@@ -124,7 +136,7 @@ class IsolateSampleProfileRepository
     assert(forceFetch != null);
     S.Isolate isolate = i as S.Isolate;
     assert(isolate != null);
-    if (_last != null && !clear && !forceFetch && _last.isolate == isolate) {
+    if ((_last != null) && !clear && !forceFetch && (_last.owner == isolate)) {
       _last.reuse();
     } else {
       _last = new SampleProfileLoadingProgress(isolate, t, clear);
@@ -156,3 +168,20 @@ class ClassSampleProfileRepository implements M.ClassSampleProfileRepository {
     return cls.setTraceAllocations(false);
   }
 }
+
+class NativeMemorySampleProfileRepository
+    implements M.NativeMemorySampleProfileRepository {
+  SampleProfileLoadingProgress _last;
+
+  Stream<SampleProfileLoadingProgressEvent> get(M.VM vm, M.SampleProfileTag t,
+      {bool forceFetch: false}) {
+    assert(forceFetch != null);
+    if ((_last != null) && !forceFetch) {
+      _last.reuse();
+    } else {
+      _last = new SampleProfileLoadingProgress(vm, t, false,
+          type: M.SampleProfileType.memory);
+    }
+    return _last.onProgress;
+  }
+}