[inspector] Return error when paused in different context group

src/inspector/v8-debugger.h

Index: src/inspector/v8-debugger.h
diff --git a/src/inspector/v8-debugger.h b/src/inspector/v8-debugger.h
index 4c4f94cf54ee0691db32ddf5d36678ca7d5b32dd..107ef854d648fa209015202237a44f31128144cf 100644
--- a/src/inspector/v8-debugger.h
+++ b/src/inspector/v8-debugger.h
@@ -83,6 +83,7 @@ class V8Debugger : public v8::debug::DebugDelegate {
   void disable();
 
   bool isPaused() const { return m_pausedContextGroupId; }
+  bool isPausedInContextGroup(int contextGroupId) const;
   v8::Local<v8::Context> pausedContext() { return m_pausedContext; }
 
   int maxAsyncCallChainDepth() { return m_maxAsyncCallStackDepth; }