Expose function CheckDebugBreak in the debugger api

src/api.cc

 // 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.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 6889 matching lines @@
   reinterpret_cast<i::Isolate*>(isolate)->stack_guard()->RequestDebugBreak();
 }
 
 
 void Debug::CancelDebugBreak(Isolate* isolate) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   internal_isolate->stack_guard()->ClearDebugBreak();
 }
 
 
+bool Debug::CheckDebugBreak(Isolate* isolate) {
+  i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
+  return internal_isolate->stack_guard()->CheckDebugBreak();
+}
+
+
 void Debug::DebugBreakForCommand(Isolate* isolate, ClientData* data) {
   i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate);
   internal_isolate->debug()->EnqueueDebugCommand(data);
 }
 
 
 void Debug::SetMessageHandler(v8::Debug::MessageHandler handler) {
   i::Isolate* isolate = i::Isolate::Current();
   EnsureInitializedForIsolate(isolate, "v8::Debug::SetMessageHandler");
   ENTER_V8(isolate);
@@ skipping 724 matching lines @@
   Isolate* isolate = reinterpret_cast<Isolate*>(info.GetIsolate());
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 } }  // namespace v8::internal