[inspector] better stacks for promises

test/inspector/debugger/promise-chain-when-limit-hit.js

Index: test/inspector/debugger/promise-chain-when-limit-hit.js
diff --git a/test/inspector/debugger/promise-chain-when-limit-hit.js b/test/inspector/debugger/promise-chain-when-limit-hit.js
new file mode 100644
index 0000000000000000000000000000000000000000..53ff71780cb95d2237b2279c5d1dfe42962af505
--- /dev/null
+++ b/test/inspector/debugger/promise-chain-when-limit-hit.js
@@ -0,0 +1,51 @@
+// 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.
+
+(async function test(){
+  InspectorTest.log('Checks correctness of promise chains when limit hit');
+  await Protocol.Runtime.enable();
+  await Protocol.Debugger.enable();
+  Protocol.Debugger.setAsyncCallStackDepth({maxDepth: 128});
+
+  await setMaxAsyncTaskStacks(3);
+  runWithAsyncChainPromise(3, 'console.trace()');
+  InspectorTest.logMessage(await Protocol.Runtime.onceConsoleAPICalled());
+
+  await setMaxAsyncTaskStacks(4);
+  runWithAsyncChainPromise(3, 'console.trace()');
+  InspectorTest.logMessage(await Protocol.Runtime.onceConsoleAPICalled());
+
+  await setMaxAsyncTaskStacks(5);
+  runWithAsyncChainPromise(3, 'console.trace()');
+  InspectorTest.logMessage(await Protocol.Runtime.onceConsoleAPICalled());
+
+  await setMaxAsyncTaskStacks(6);
+  runWithAsyncChainPromise(3, 'console.trace()');
+  InspectorTest.logMessage(await Protocol.Runtime.onceConsoleAPICalled());
+
+  await setMaxAsyncTaskStacks(7);
+  runWithAsyncChainPromise(3, 'console.trace()');
+  InspectorTest.logMessage(await Protocol.Runtime.onceConsoleAPICalled());
+
+  await setMaxAsyncTaskStacks(8);
+  runWithAsyncChainPromise(3, 'console.trace()');
+  InspectorTest.logMessage(await Protocol.Runtime.onceConsoleAPICalled());
+
+  InspectorTest.completeTest();
+})();
+
+function runWithAsyncChainPromise(len, source) {
+  InspectorTest.log(`Run expression '${source}' with async chain len: ${len}`);
+  let then = '.then(() => 1)';
+  let pause = `.then(() => { ${source} })`;
+  Protocol.Runtime.evaluate({
+    expression: `Promise.resolve()${then.repeat(len - 1)}${pause}`
+  });
+}
+
+async function setMaxAsyncTaskStacks(max) {
+  let expression = `inspector.setMaxAsyncTaskStacks(${max})`;
+  InspectorTest.log(expression);
+  await Protocol.Runtime.evaluate({expression});
+}