[inspector] Create InjectedScript per session in each context

test/inspector/protocol-test.js

 // 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.
 
 InspectorTest = {};
 InspectorTest._dumpInspectorProtocolMessages = false;
 InspectorTest._commandsForLogging = new Set();
 InspectorTest._sessions = new Set();
 
 InspectorTest.log = utils.print.bind(utils);
@@ skipping 168 matching lines @@
   disconnect() {
     InspectorTest._sessions.delete(this);
     utils.disconnectSession(this.id);
   }
 
   reconnect() {
     var state = utils.disconnectSession(this.id);
     this.id = utils.connectSession(this.contextGroup.id, state, this._dispatchMessage.bind(this));
   }
 
+  async addInspectedObject(serializable) {
+    return this.Protocol.Runtime.evaluate({expression: `inspector.addInspectedObject(${this.id}, ${JSON.stringify(serializable)})`});
+  }
+
   sendRawCommand(requestId, command, handler) {
     if (InspectorTest._dumpInspectorProtocolMessages)
       utils.print("frontend: " + command);
     this._dispatchTable.set(requestId, handler);
     utils.sendMessageToBackend(this.id, command);
   }
 
   setupScriptMap() {
     if (this._scriptMap)
       return;
@@ skipping 172 matching lines @@
 InspectorTest.start = function(description) {
   try {
     InspectorTest.log(description);
     var contextGroup = new InspectorTest.ContextGroup();
     var session = contextGroup.connect();
     return { session: session, contextGroup: contextGroup, Protocol: session.Protocol };
   } catch (e) {
     utils.print(e.stack);
   }
 }