[inspector] Create InjectedScript per session in each context

src/inspector/inspected-context.cc

 // 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.
 
 #include "src/inspector/inspected-context.h"
 
 #include "src/debug/debug-interface.h"
 #include "src/inspector/injected-script.h"
 #include "src/inspector/string-util.h"
 #include "src/inspector/v8-console.h"
@@ skipping 46 matching lines @@
   return m_reportedSessionIds.find(sessionId) != m_reportedSessionIds.cend();
 }
 
 void InspectedContext::setReported(int sessionId, bool reported) {
   if (reported)
     m_reportedSessionIds.insert(sessionId);
   else
     m_reportedSessionIds.erase(sessionId);
 }
 
-bool InspectedContext::createInjectedScript() {
-  DCHECK(!m_injectedScript);
-  std::unique_ptr<InjectedScript> injectedScript = InjectedScript::create(this);
+InjectedScript* InspectedContext::getInjectedScript(int sessionId) {
+  auto it = m_injectedScripts.find(sessionId);
+  return it == m_injectedScripts.end() ? nullptr : it->second.get();
+}
+
+bool InspectedContext::createInjectedScript(int sessionId) {
+  DCHECK(m_injectedScripts.find(sessionId) == m_injectedScripts.end());
+  std::unique_ptr<InjectedScript> injectedScript =
+      InjectedScript::create(this, sessionId);
   // InjectedScript::create can destroy |this|.
   if (!injectedScript) return false;
-  m_injectedScript = std::move(injectedScript);
+  m_injectedScripts[sessionId] = std::move(injectedScript);
   return true;
 }
 
-void InspectedContext::discardInjectedScript() { m_injectedScript.reset(); }
+void InspectedContext::discardInjectedScript(int sessionId) {
+  m_injectedScripts.erase(sessionId);
+}
 
 }  // namespace v8_inspector