[futex] Allow debugger to break in the middle of a futexWait

src/debug/debug.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DEBUG_DEBUG_H_
 #define V8_DEBUG_DEBUG_H_
 
 #include "src/allocation.h"
 #include "src/arguments.h"
 #include "src/assembler.h"
@@ skipping 353 matching lines @@
   void OnAsyncTaskEvent(Handle<JSObject> data);
 
   // API facing.
   void SetEventListener(Handle<Object> callback, Handle<Object> data);
   void SetMessageHandler(v8::Debug::MessageHandler handler);
   void EnqueueCommandMessage(Vector<const uint16_t> command,
                              v8::Debug::ClientData* client_data = NULL);
   MUST_USE_RESULT MaybeHandle<Object> Call(Handle<JSFunction> fun,
                                            Handle<Object> data);
   Handle<Context> GetDebugContext();
-  void HandleDebugBreak();
+  void HandleDebugBreak(
+      BreakInNonDebuggableFlag flag = DontBreakInNonDebuggable);
   void ProcessDebugMessages(bool debug_command_only);
 
   // Internal logic
   bool Load();
   void Break(Arguments args, JavaScriptFrame*);
   void SetAfterBreakTarget(JavaScriptFrame* frame);
 
   // Scripts handling.
   Handle<FixedArray> GetLoadedScripts();
 
@@ skipping 375 matching lines @@
                            int call_argc = -1);
 
   static void PatchDebugBreakSlot(Address pc, Handle<Code> code);
   static void ClearDebugBreakSlot(Address pc);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_DEBUG_DEBUG_H_