[inspector] Test how Profiler interacts with multiple sessions

BUG=chromium:590878

Review-Url: https://codereview.chromium.org/2920313002
Cr-Original-Commit-Position: refs/heads/master@{#45715}
Committed: https://chromium.googlesource.com/v8/v8/+/754f81e20e9e7abfb3ce82e73a3389a72f4657a6
Review-Url: https://codereview.chromium.org/2920313002
Cr-Commit-Position: refs/heads/master@{#45717}

test/inspector/sessions/cpu-profile-expected.txt

+Tests that multiple sessions can record profiles concurrently.
+console.profile in 1
+console profile started from 2: one
+console profile started from 1: one
+console profile finished from 2: one
+console profile finished from 1: one
+console.profile in 2
+console profile started from 2: two
+console profile started from 1: two
+console profile finished from 2: two
+console profile finished from 1: two
+starting in 1
+starting in 2
+stopping in 1
+stopped in 1
+stopping in 2
+stopped in 2

test/inspector/sessions/cpu-profile.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 can record profiles concurrently.');
+
+var contextGroup = new InspectorTest.ContextGroup();
+contextGroup.addScript(`
+function foo() {
+  var doSomeWork = 1;
+  for (var i = 0; i < 1000; i++)
+    doSomeWork += i;
+  return doSomeWork;
+}
+//# sourceURL=test.js`, 7, 26);
+
+(async function test() {
+  var session1 = await connect(contextGroup, 1);
+  var session2 = await connect(contextGroup, 2);
+
+  InspectorTest.log('console.profile in 1');
+  await session1.Protocol.Runtime.evaluate({expression: 'console.profile("one"); foo(); console.profileEnd("one");'});
+  InspectorTest.log('console.profile in 2');
+  await session2.Protocol.Runtime.evaluate({expression: 'console.profile("two"); foo(); console.profileEnd("two");'});
+
+  InspectorTest.log('starting in 1');
+  session1.Protocol.Profiler.start();
+  InspectorTest.log('starting in 2');
+  session2.Protocol.Profiler.start();
+  await session1.Protocol.Runtime.evaluate({expression: 'foo();'});
+
+  InspectorTest.log('stopping in 1');
+  var message = await session1.Protocol.Profiler.stop();
+  InspectorTest.log('stopped in 1');
+
+  InspectorTest.log('stopping in 2');
+  var message = await session2.Protocol.Profiler.stop();
+  InspectorTest.log('stopped in 2');
+
+  InspectorTest.completeTest();
+})();
+
+async function connect(contextGroup, num) {
+  var session = contextGroup.connect();
+  session.Protocol.Profiler.onConsoleProfileStarted(message => {
+    InspectorTest.log(`console profile started from ${num}: ${message.params.title}`);
+  });
+  session.Protocol.Profiler.onConsoleProfileFinished(message => {
+    InspectorTest.log(`console profile finished from ${num}: ${message.params.title}`);
+  });
+  await session.Protocol.Profiler.enable();
+  await session.Protocol.Profiler.setSamplingInterval({interval: 100});
+  return session;
+}