Merge up to 8597 to experimental/gc from the bleeding edge.

src/d8-debug.cc

Index: src/d8-debug.cc
===================================================================
--- src/d8-debug.cc	(revision 8618)
+++ src/d8-debug.cc	(working copy)
@@ -159,7 +159,7 @@
 
 
 void RunRemoteDebugger(int port) {
-  RemoteDebugger debugger(i::Isolate::Current(), port);
+  RemoteDebugger debugger(port);
   debugger.Run();
 }
 
@@ -186,11 +186,11 @@
   }
 
   // Start the receiver thread.
-  ReceiverThread receiver(isolate_, this);
+  ReceiverThread receiver(this);
   receiver.Start();
 
   // Start the keyboard thread.
-  KeyboardThread keyboard(isolate_, this);
+  KeyboardThread keyboard(this);
   keyboard.Start();
   PrintPrompt();
 
@@ -272,6 +272,7 @@
 
 
 void RemoteDebugger::HandleMessageReceived(char* message) {
+  Locker lock;
   HandleScope scope;
 
   // Print the event details.
@@ -300,6 +301,7 @@
 
 
 void RemoteDebugger::HandleKeyboardCommand(char* command) {
+  Locker lock;
   HandleScope scope;
 
   // Convert the debugger command to a JSON debugger request.