[debug-wrapper] Further extend the debug wrapper

test/mjsunit/regress/regress-crbug-432493.js

-// Copyright 2014 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.
-
-// Flags: --expose-debug-as debug
-
-function f() {
-  var a = 1;
-  var b = 2;
-  return a + b;
-}
-
-var exception = null;
-var break_count = 0;
-var throw_count = 0;
-
-function listener(event, exec_state, event_data, data) {
-  try {
-    if (event == Debug.DebugEvent.Break) {
-      break_count++;
-      // Disable all breakpoints from within the debug event callback.
-      Debug.debuggerFlags().breakPointsActive.setValue(false);
-    } else if (event = Debug.DebugEvent.Exception) {
-      throw_count++;
-      // Enable all breakpoints from within the debug event callback.
-      Debug.debuggerFlags().breakPointsActive.setValue(true);
-    }
-  } catch (e) {
-    exception = e;
-  }
-}
-
-Debug = debug.Debug;
-
-Debug.setListener(listener);
-Debug.setBreakOnException();
-Debug.setBreakPoint(f, 2);
-
-f();
-f();
-
-assertEquals(1, break_count);
-assertEquals(0, throw_count);
-
-// Trigger exception event.
-try { throw 1; } catch (e) {}
-
-f();
-f();
-
-Debug.setListener(null);
-Debug.clearBreakOnException();
-Debug.debuggerFlags().breakPointsActive.setValue(true);
-
-assertEquals(2, break_count);
-assertEquals(1, throw_count);
-assertNull(exception);