Heap profiler: implement diffing of snapshots.

src/heap-profiler.cc

Index: src/heap-profiler.cc
diff --git a/src/heap-profiler.cc b/src/heap-profiler.cc
index 73b9748f18a4c4f00894864ac33929c7fccba7b6..92ded7b3477a67054b1dbb4e2e906329feefdf04 100644
--- a/src/heap-profiler.cc
+++ b/src/heap-profiler.cc
@@ -364,6 +364,7 @@ HeapSnapshot* HeapProfiler::TakeSnapshotImpl(const char* name) {
   HeapSnapshot* result = snapshots_->NewSnapshot(name, next_snapshot_uid_++);
   HeapSnapshotGenerator generator(result);
   generator.GenerateSnapshot();
+  snapshots_->SnapshotGenerationFinished();
   return result;
 }
 
@@ -391,6 +392,12 @@ HeapSnapshot* HeapProfiler::FindSnapshot(unsigned uid) {
 }
 
 
+void HeapProfiler::ObjectMoveEvent(Address from, Address to) {
+  ASSERT(singleton_ != NULL);
+  singleton_->snapshots_->ObjectMoveEvent(from, to);
+}
+
+
 const JSObjectsClusterTreeConfig::Key JSObjectsClusterTreeConfig::kNoKey;
 const JSObjectsClusterTreeConfig::Value JSObjectsClusterTreeConfig::kNoValue;