Introduce mechanism to record an allocation of a class

runtime/vm/profiler.h

 // Copyright (c) 2013, 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 VM_PROFILER_H_
 #define VM_PROFILER_H_
 
 #include "vm/allocation.h"
 #include "vm/bitfield.h"
 #include "vm/code_observers.h"
@@ skipping 26 matching lines @@
                                       bool shared_buffer = true);
   static void ShutdownProfilingForIsolate(Isolate* isolate);
 
   static void BeginExecution(Isolate* isolate);
   static void EndExecution(Isolate* isolate);
 
   static SampleBuffer* sample_buffer() {
     return sample_buffer_;
   }
 
+  static void RecordAllocation(Isolate* isolate, intptr_t cid);
+
  private:
   static bool initialized_;
   static Monitor* monitor_;
 
   static void RecordSampleInterruptCallback(const InterruptedThreadState& state,
                                             void* data);
 
   static SampleBuffer* sample_buffer_;
 };
 
@@ skipping 244 matching lines @@
 
   intptr_t allocation_cid() const {
     ASSERT(is_allocation_sample());
     return metadata_;
   }
 
   void set_metadata(intptr_t metadata) {
     metadata_ = metadata;
   }
 
+  void SetAllocationCid(intptr_t cid) {
+    set_is_allocation_sample(true);
+    set_metadata(cid);
+  }
+
   static void InitOnce();
 
   static intptr_t instance_size() {
     return instance_size_;
   }
 
   uword* GetPCArray() const;
 
   static const int kStackBufferSizeInWords = 2;
   uword* GetStackBuffer() {
@@ skipping 206 matching lines @@
 
  private:
   ZoneGrowableArray<ProcessedSample*> samples_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessedSampleBuffer);
 };
 
 }  // namespace dart
 
 #endif  // VM_PROFILER_H_