[inspector] use debuggerContext as current in getPossibleBreakpoints

src/inspector/v8-debugger-agent-impl.cc

Index: src/inspector/v8-debugger-agent-impl.cc
diff --git a/src/inspector/v8-debugger-agent-impl.cc b/src/inspector/v8-debugger-agent-impl.cc
index 8c9e9054a2143706c066d249d13c66b42ca9d7fa..325d0a2a34b90eeda91062163e011abecfef25d5 100644
--- a/src/inspector/v8-debugger-agent-impl.cc
+++ b/src/inspector/v8-debugger-agent-impl.cc
@@ -355,9 +355,10 @@ Response V8DebuggerAgentImpl::getPossibleBreakpoints(
     std::unique_ptr<protocol::Array<protocol::Debugger::Location>>* locations) {
   String16 scriptId = start->getScriptId();
 
-  if (start->getLineNumber() < 0 || start->getColumnNumber(0) < 0)
+  if (start->getLineNumber() < 0 || start->getColumnNumber(0) < 0) {
     return Response::Error(
         "start.lineNumber and start.columnNumber should be >= 0");
+  }
 
   v8::DebugInterface::Location v8Start(start->getLineNumber(),
                                        start->getColumnNumber(0));
@@ -375,6 +376,9 @@ Response V8DebuggerAgentImpl::getPossibleBreakpoints(
   auto it = m_scripts.find(scriptId);
   if (it == m_scripts.end()) return Response::Error("Script not found");
 
+  v8::HandleScope handleScope(m_isolate);
+  v8::Context::Scope scope(v8::DebugInterface::GetDebugContext(m_isolate));
+
   std::vector<v8::DebugInterface::Location> v8Locations;
   if (!it->second->getPossibleBreakpoints(v8Start, v8End, &v8Locations))
     return Response::InternalError();