Implement issue 554 Add "ProcessDebuggerRequests" call to Debug Agent API

src/execution.cc

Index: src/execution.cc
diff --git a/src/execution.cc b/src/execution.cc
index 0f935ac8a108a66b60e4822ceb1805441830d514..a79af2373c3a951de695ae12bcb1dd6994733263 100644
--- a/src/execution.cc
+++ b/src/execution.cc
@@ -638,24 +638,32 @@ Object* Execution::DebugBreakHelper() {
   bool debug_command_only =
       StackGuard::IsDebugCommand() && !StackGuard::IsDebugBreak();
 
-  // Clear the debug request flags.
+  // Clear the debug break request flag.
   StackGuard::Continue(DEBUGBREAK);
+
+  ProcessDebugMesssages(debug_command_only);
+
+  // Return to continue execution.
+  return Heap::undefined_value();
+}
+
+void Execution::ProcessDebugMesssages(bool debug_command_only) {
+  // Clear the debug command request flag.
   StackGuard::Continue(DEBUGCOMMAND);
 
   HandleScope scope;
   // Enter the debugger. Just continue if we fail to enter the debugger.
   EnterDebugger debugger;
   if (debugger.FailedToEnter()) {
-    return Heap::undefined_value();
+    return;
   }
 
   // Notify the debug event listeners. Indicate auto continue if the break was
   // a debug command break.
   Debugger::OnDebugBreak(Factory::undefined_value(), debug_command_only);
-
-  // Return to continue execution.
-  return Heap::undefined_value();
 }
+
+
 #endif
 
 Object* Execution::HandleStackGuardInterrupt() {