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

src/debug/debug-interface.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_DEBUG_DEBUG_INTERFACE_H_
 #define V8_DEBUG_DEBUG_INTERFACE_H_
 
 #include "include/v8-debug.h"
 #include "include/v8-util.h"
 #include "include/v8.h"
@@ skipping 136 matching lines @@
 
   ScriptOriginOptions OriginOptions() const;
   bool WasCompiled() const;
   int Id() const;
   int LineOffset() const;
   int ColumnOffset() const;
   std::vector<int> LineEnds() const;
   MaybeLocal<String> Name() const;
   MaybeLocal<String> SourceURL() const;
   MaybeLocal<String> SourceMappingURL() const;
-  MaybeLocal<String> ContextData() const;
+  MaybeLocal<Value> ContextData() const;
   MaybeLocal<String> Source() const;
   bool IsWasm() const;
   bool GetPossibleBreakpoints(const debug::Location& start,
                               const debug::Location& end,
                               std::vector<debug::Location>* locations) const;
 
   /**
    * script parameter is a wrapper v8::internal::JSObject for
    * v8::internal::Script.
    * This function gets v8::internal::Script from v8::internal::JSObject and
@@ skipping 21 matching lines @@
 
 void GetLoadedScripts(Isolate* isolate, PersistentValueVector<Script>& scripts);
 
 MaybeLocal<UnboundScript> CompileInspectorScript(Isolate* isolate,
                                                  Local<String> source);
 
 }  // namespace debug
 }  // namespace v8
 
 #endif  // V8_DEBUG_DEBUG_INTERFACE_H_