[DevTools] New harness for inspector-protocol layout tests

third_party/WebKit/LayoutTests/inspector-protocol/console/console-let-const-with-api.js

+(async function(testRunner) {
+  let {page, session, dp} = await testRunner.startBlank('');
+
+  var response = await dp.Runtime.evaluate({expression: 'let a = 42;'});
+  failIfError(response);
+  testRunner.log('first \'let a = 1;\' result: wasThrown = ' + !!response.result.exceptionDetails);
+
+  response = await dp.Runtime.evaluate({expression: 'let a = 239;'});
+  failIfError(response);
+  testRunner.log('second \'let a = 1;\' result: wasThrown = ' + !!response.result.exceptionDetails);
+  if (response.result.exceptionDetails)
+    testRunner.log('exception message: ' + response.result.exceptionDetails.text + ' ' + response.result.exceptionDetails.exception.description);
+
+  response = await dp.Runtime.evaluate({expression: 'a'});
+  failIfError(response);
+  testRunner.log(JSON.stringify(response.result));
+
+  var methods = [ '$', '$$', '$x', 'dir', 'dirxml', 'keys', 'values', 'profile', 'profileEnd',
+      'monitorEvents', 'unmonitorEvents', 'inspect', 'copy', 'clear', 'getEventListeners',
+      'debug', 'undebug', 'monitor', 'unmonitor', 'table' ];
+  for (var method of methods) {
+    response = await dp.Runtime.evaluate({expression: method, includeCommandLineAPI: true});
+    failIfError(response);
+    testRunner.log(response.result.result.description);
+  }
+  testRunner.completeTest();
+
+  function failIfError(response) {
+    if (response && response.error) {
+      testRunner.log('FAIL: ' + JSON.stringify(response.error));
+      testRunner.completeTest();
+    }
+  }
+})