[debugger] Various break-related functionality in test wrapper

test/debugger/wrapper/enable-disable.js

 // Copyright 2016 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.
 
 let compileCount = 0;
 
 const Debug = new DebugWrapper();
 
 Debug.setListener(function(event, exec_state, event_data, data) {
-  if (event != DebugEvent.AfterCompile) return;
+  if (event != Debug.DebugEvent.AfterCompile) return;
   compileCount++;
 });
 
 Debug.enable();
 assertTrue(compileCount != 0);
 
 const compileCountAfterEnable = compileCount;
 
 Debug.enable();  // Idempotent.
 assertEquals(compileCountAfterEnable, compileCount);
 
 Debug.disable();
 assertEquals(compileCountAfterEnable, compileCount);
 
 Debug.disable();  // Idempotent.
 assertEquals(compileCountAfterEnable, compileCount);
 
 Debug.enable();  // Re-enabling causes recompilation.
 assertEquals(2 * compileCountAfterEnable, compileCount);