[inspector] Store interger in context embedder data instead of a string.

src/inspector/v8-inspector-impl.h

 /*
  * Copyright (c) 2010, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 40 matching lines @@
 class V8StackTraceImpl;
 
 class V8InspectorImpl : public V8Inspector {
  public:
   V8InspectorImpl(v8::Isolate*, V8InspectorClient*);
   ~V8InspectorImpl() override;
 
   v8::Isolate* isolate() const { return m_isolate; }
   V8InspectorClient* client() { return m_client; }
   V8Debugger* debugger() { return m_debugger.get(); }
+  int contextGroupId(v8::Local<v8::Context>);
+  int contextGroupId(int contextId);
 
   v8::MaybeLocal<v8::Value> runCompiledScript(v8::Local<v8::Context>,
                                               v8::Local<v8::Script>);
   v8::MaybeLocal<v8::Value> callFunction(v8::Local<v8::Function>,
                                          v8::Local<v8::Context>,
                                          v8::Local<v8::Value> receiver,
                                          int argc, v8::Local<v8::Value> info[]);
   v8::MaybeLocal<v8::Value> compileAndRunInternalScript(v8::Local<v8::Context>,
                                                         v8::Local<v8::String>);
   v8::MaybeLocal<v8::Value> callInternalFunction(v8::Local<v8::Function>,
@@ skipping 58 matching lines @@
       v8::Local<v8::Function>, v8::Local<v8::Context>,
       v8::Local<v8::Value> receiver, int argc, v8::Local<v8::Value> info[],
       v8::MicrotasksScope::Type runMicrotasks);
 
   v8::Isolate* m_isolate;
   V8InspectorClient* m_client;
   std::unique_ptr<V8Debugger> m_debugger;
   v8::Global<v8::Context> m_regexContext;
   int m_capturingStackTracesCount;
   unsigned m_lastExceptionId;
+  int m_lastContextId;
 
   using MuteExceptionsMap = protocol::HashMap<int, int>;
   MuteExceptionsMap m_muteExceptionsMap;
 
   using ContextsByGroupMap =
       protocol::HashMap<int, std::unique_ptr<ContextByIdMap>>;
   ContextsByGroupMap m_contexts;
 
   using SessionMap = protocol::HashMap<int, V8InspectorSessionImpl*>;
   SessionMap m_sessions;
 
   using ConsoleStorageMap =
       protocol::HashMap<int, std::unique_ptr<V8ConsoleMessageStorage>>;
   ConsoleStorageMap m_consoleStorageMap;
 
+  protocol::HashMap<int, int> m_contextIdToGroupIdMap;
+
   DISALLOW_COPY_AND_ASSIGN(V8InspectorImpl);
 };
 
 }  // namespace v8_inspector
 
 #endif  // V8_INSPECTOR_V8INSPECTORIMPL_H_