Don't unload debug context after it was requested through public API

Review URL: http://codereview.chromium.org/1731011

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4524 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/api.cc

@@ -4020,8 +4020,8 @@ void Debug::ProcessDebugMessages() {
 }
 
 Local<Context> Debug::GetDebugContext() {
-  i::EnterDebugger debugger;
-  return Utils::ToLocal(i::Debug::debug_context());
+  ENTER_V8;
+  return Utils::ToLocal(i::Debugger::GetDebugContext());
 }
 
 #endif  // ENABLE_DEBUGGER_SUPPORT

src/debug.cc

@@ -2133,6 +2133,13 @@ void Debugger::ProcessDebugEvent(v8::DebugEvent event,
 }
 
 
+Handle<Context> Debugger::GetDebugContext() {
+    never_unload_debugger_ = true;
+    EnterDebugger debugger;
+    return Debug::debug_context();
+}
+
+
 void Debugger::UnloadDebugger() {
   // Make sure that there are no breakpoints left.
   Debug::ClearAllBreakPoints();

src/debug.h

@@ -665,6 +665,8 @@ class Debugger {
 
   static void CallMessageDispatchHandler();
 
+  static Handle<Context> GetDebugContext();
+
   // Unload the debugger if possible. Only called when no debugger is currently
   // active.
   static void UnloadDebugger();

test/cctest/test-debug.cc

@@ -6139,3 +6139,12 @@ TEST(CallingContextIsNotDebugContext) {
   debugger_context = v8::Handle<v8::Context>();
   CheckDebuggerUnloaded();
 }
+
+
+TEST(DebugContextIsPreservedBetweenAccesses) {
+  v8::HandleScope scope;
+  v8::Local<v8::Context> context1 = v8::Debug::GetDebugContext();
+  v8::Local<v8::Context> context2 = v8::Debug::GetDebugContext();
+  CHECK_EQ(*context1, *context2);
+}
+