Expose allocation tracing over service protocol

runtime/observatory/lib/src/service/object.dart

Index: runtime/observatory/lib/src/service/object.dart
diff --git a/runtime/observatory/lib/src/service/object.dart b/runtime/observatory/lib/src/service/object.dart
index 0eee58f8a2ca4b30ab15fa6483da929c5693d639..dd4039d67a36804f307714c3141cade90f15eabe 100644
--- a/runtime/observatory/lib/src/service/object.dart
+++ b/runtime/observatory/lib/src/service/object.dart
@@ -1896,7 +1896,7 @@ class Class extends ServiceObject with Coverage {
   final AllocationCount promotedByLastNewGC = new AllocationCount();
 
   @observable bool get hasNoAllocations => newSpace.empty && oldSpace.empty;
-
+  @observable bool traceAllocations = false;
   @reflectable final fields = new ObservableList<Field>();
   @reflectable final functions = new ObservableList<ServiceFunction>();
 
@@ -1963,6 +1963,9 @@ class Class extends ServiceObject with Coverage {
     }
     error = map['error'];
 
+    traceAllocations =
+        (map['_traceAllocations'] != null) ? map['_traceAllocations'] : false;
+
     var allocationStats = map['_allocationStats'];
     if (allocationStats != null) {
       newSpace.update(allocationStats['new']);
@@ -1985,6 +1988,19 @@ class Class extends ServiceObject with Coverage {
     return isolate._eval(this, expression);
   }
 
+  Future<ServiceObject> setTraceAllocations(bool enable) {
+    return isolate.invokeRpc('_traceClassAllocation', {
+        'enable': enable,
+        'classId': id,
+      });
+  }
+
+  Future<ServiceObject> getAllocationProfile([String tags = 'None']) {
+    var params = { 'tags': tags,
+                   'classId': id };
+    return isolate.invokeRpc('_getCpuProfile', params);

[turnidge, 2015/07/13 23:37:48]

Calling this _getCpuProfile doesn't seem right.  Perhaps this should get its own
rpc.

[Cutch, 2015/07/14 15:53:47]

_getAllocationSamples

+  }
+
   String toString() => 'Class($vmName)';
 }