Allow setting break-on-exceptions option over the service protocol.

runtime/observatory/tests/service/pause_on_exceptions_test.dart

+// Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+// VMOptions=--compile_all --error_on_bad_type --error_on_bad_override
+
+import 'package:observatory/service_io.dart';
+import 'package:unittest/unittest.dart';
+import 'test_helper.dart';
+import 'dart:async';
+import 'dart:developer';
+
+doThrow() {
+  throw "TheException"; // Line 13.
+  return "end of doThrow";
+}
+
+doCaught() {
+  try {
+    doThrow();
+  } catch (e) {}
+  return "end of doCaught";
+}
+
+doUncaught() {
+  doThrow();
+  return "end of doUncaught";
+}
+
+var tests = [
+
+(Isolate isolate) async {
+  var lib = await isolate.rootLibrary.reload();
+
+  var onPaused = null;
+  var onResume = null;
+
+  var subscription;
+  subscription = isolate.vm.events.stream.listen((ServiceEvent event) {
+    print("Event $event");
+    if (event.kind == ServiceEvent.kPauseException) {
+      if (onPaused == null) throw "Unexpected pause event $event";
+      var t = onPaused;
+      onPaused = null;
+      t.complete(event);
+    }
+    if (event.kind == ServiceEvent.kResume) {
+      if (onResume == null) throw "Unexpected resume event $event";
+      var t = onResume;
+      onResume = null;
+      t.complete(event);
+    }
+  });
+
+  test(String pauseInfo,
+       String expression,
+       bool shouldPause,
+       bool shouldBeCaught) async {
+    print("Evaluating $expression with pause on $pauseInfo exception");
+
+    expect((await isolate.setExceptionPauseInfo(pauseInfo)) is DartError,
+           isFalse);
+
+    var t;
+    if (shouldPause) {
+      t = new Completer();
+      onPaused = t;
+    }
+    var fres = lib.evaluate(expression);
+    if (shouldPause) {
+      await t.future;
+
+      var stack = await isolate.getStack();
+      expect(stack['frames'][0].function.name, equals('doThrow'));
+      // Ugh, no .line. expect(stack['frames'][0].location.line, equals(17));
+
+      t = new Completer();
+      onResume = t;
+      isolate.resume();
+      await t.future;
+    }
+
+    var res = await fres;
+    print(res);
+    if (shouldBeCaught) {
+      expect(res.isInstance, isTrue);
+      expect(res.isString, isTrue);
+      expect(res.valueAsString, equals("end of doCaught"));
+    } else {
+      expect(res.isError, isTrue);
+      await res.load(); // Weird?
+      expect(res.exception.isInstance, isTrue);
+      expect(res.exception.isString, isTrue);
+      expect(res.exception.valueAsString, equals("TheException"));
+    }
+  }
+
+  await test("all", "doCaught()", true, true);
+  await test("all", "doUncaught()", true, false);
+
+  await test("unhandled", "doCaught()", false, true);
+  await test("unhandled", "doUncaught()", true, false);
+
+  await test("none", "doCaught()", false, true);
+  await test("none", "doUncaught()", false, false);
+
+  subscription.cancel();
+},
+
+];
+
+main(args) => runIsolateTests(args, tests);