Add support for CPU and heap profiles deletion.

src/heap-profiler.cc

Index: src/heap-profiler.cc
diff --git a/src/heap-profiler.cc b/src/heap-profiler.cc
index c78f474472a5fde56f7bf3206a7d68caba079eba..4815f8264fd0ca985c819d7cfee8b1b9423a2e08 100644
--- a/src/heap-profiler.cc
+++ b/src/heap-profiler.cc
@@ -326,6 +326,13 @@ HeapProfiler::~HeapProfiler() {
   delete snapshots_;
 }
 
+
+void HeapProfiler::ResetSnapshots() {
+  delete snapshots_;
+  snapshots_ = new HeapSnapshotsCollection();
+}
+
+
 #endif  // ENABLE_LOGGING_AND_PROFILING
 
 void HeapProfiler::Setup() {
@@ -450,6 +457,13 @@ HeapSnapshot* HeapProfiler::FindSnapshot(unsigned uid) {
 }
 
 
+void HeapProfiler::DeleteAllSnapshots() {
+  HeapProfiler* profiler = Isolate::Current()->heap_profiler();
+  ASSERT(profiler != NULL);
+  profiler->ResetSnapshots();
+}
+
+
 void HeapProfiler::ObjectMoveEvent(Address from, Address to) {
   snapshots_->ObjectMoveEvent(from, to);
 }