[inspector] Create InjectedScript per session in each context

src/inspector/inspected-context.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_INSPECTOR_INSPECTEDCONTEXT_H_
 #define V8_INSPECTOR_INSPECTEDCONTEXT_H_
 
-#include <map>
+#include <unordered_map>
 #include <unordered_set>
 
 #include "src/base/macros.h"
 #include "src/inspector/string-16.h"
 
 #include "include/v8.h"
 
 namespace v8_inspector {
 
 class InjectedScript;
@@ skipping 13 matching lines @@
   String16 origin() const { return m_origin; }
   String16 humanReadableName() const { return m_humanReadableName; }
   String16 auxData() const { return m_auxData; }
 
   bool isReported(int sessionId) const;
   void setReported(int sessionId, bool reported);
 
   v8::Isolate* isolate() const;
   V8InspectorImpl* inspector() const { return m_inspector; }
 
-  InjectedScript* getInjectedScript() { return m_injectedScript.get(); }
-  bool createInjectedScript();
-  void discardInjectedScript();
+  InjectedScript* getInjectedScript(int sessionId);
+  bool createInjectedScript(int sessionId);
+  void discardInjectedScript(int sessionId);
 
  private:
   friend class V8InspectorImpl;
   InspectedContext(V8InspectorImpl*, const V8ContextInfo&, int contextId);
 
   V8InspectorImpl* m_inspector;
   v8::Global<v8::Context> m_context;
   int m_contextId;
   int m_contextGroupId;
   const String16 m_origin;
   const String16 m_humanReadableName;
   const String16 m_auxData;
   std::unordered_set<int> m_reportedSessionIds;
-  std::unique_ptr<InjectedScript> m_injectedScript;
+  std::unordered_map<int, std::unique_ptr<InjectedScript>> m_injectedScripts;
 
   DISALLOW_COPY_AND_ASSIGN(InspectedContext);
 };
 
 }  // namespace v8_inspector
 
 #endif  // V8_INSPECTOR_INSPECTEDCONTEXT_H_