[inspector] Test how Profiler interacts with multiple sessions

test/inspector/sessions/cpu-profile.js

Index: test/inspector/sessions/cpu-profile.js
diff --git a/test/inspector/sessions/cpu-profile.js b/test/inspector/sessions/cpu-profile.js
new file mode 100644
index 0000000000000000000000000000000000000000..c0be6544943138ea46c901f14960bc65091614b6
--- /dev/null
+++ b/test/inspector/sessions/cpu-profile.js
@@ -0,0 +1,62 @@
+// 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 < 10000000; i++)
+    doSomeWork += i;
+  return doSomeWork;
+}
+//# sourceURL=test.js`, 7, 26);
+
+function checkProfile(profile) {
+  var foundFoo = profile.nodes.some(node => node.callFrame.functionName === 'foo');

[alph, 2017/06/05 21:10:41]

FYI: This has some probability of flaking, as there's a chance no samples land
onto foo.

[dgozman, 2017/06/05 21:50:47]

Thanks! I'm staying positive though :)

+  InspectorTest.log(`Found foo() call in profile: ${foundFoo}`);
+}
+
+(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');
+  checkProfile((message).result.profile);

[alph, 2017/06/05 21:10:41]

drop ()

[dgozman, 2017/06/05 21:50:48]

Done.

+
+  InspectorTest.log('stopping in 2');
+  var message = await session2.Protocol.Profiler.stop();
+  InspectorTest.log('stopped in 2');
+  checkProfile((message).result.profile);

[alph, 2017/06/05 21:10:40]

drop ()

[dgozman, 2017/06/05 21:50:48]

Done.

+
+  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}`);
+    checkProfile(message.params.profile);
+  });
+  await session.Protocol.Profiler.enable();
+  await session.Protocol.Profiler.setSamplingInterval({interval: 100});
+  return session;
+}