[inspector] Support multiple sessions per context group

test/inspector/sessions/runtime-evaluate.js

+// Copyright 2017 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.log('Tests that multiple sessions share the context.');
+
+(async function test() {
+  var contextGroup = new InspectorTest.ContextGroup();
+  var session1 = contextGroup.connect();
+  var session2 = contextGroup.connect();
+
+  InspectorTest.log('Assigning in 1');
+  await session1.Protocol.Runtime.evaluate({expression: 'var a = 42;'});
+  InspectorTest.log('Evaluating in 2');
+  InspectorTest.logMessage(await session2.Protocol.Runtime.evaluate({expression: 'a'}));
+
+  InspectorTest.log('Awaiting in 1');
+  var promise = session1.Protocol.Runtime.evaluate({expression: 'var cb; new Promise(f => cb = f)', awaitPromise: true});
+  InspectorTest.log('Resolving in 2');
+  await session2.Protocol.Runtime.evaluate({expression: 'cb("foo")'});
+  InspectorTest.log('Should resolve in 1');
+  InspectorTest.logMessage(await promise);
+
+  InspectorTest.completeTest();
+})();