Add kInvalidExceptionPauseInfo and fix the build

runtime/include/dart_tools_api.h

 // Copyright (c) 2011, 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.
 
 #ifndef INCLUDE_DART_TOOLS_API_H_
 #define INCLUDE_DART_TOOLS_API_H_
 
 #include "include/dart_api.h"
 
 /** \mainpage Dart Tools Embedding API Reference
@@ skipping 323 matching lines @@
  *   - shutdown of an isolate
  *   - interruption of an isolate
  */
 DART_EXPORT void Dart_SetIsolateEventHandler(Dart_IsolateEventHandler handler);
 
 // On which exceptions to pause.
 typedef enum {
   kNoPauseOnExceptions = 1,
   kPauseOnUnhandledExceptions,
   kPauseOnAllExceptions,
+  kInvalidExceptionPauseInfo
 } Dart_ExceptionPauseInfo;
 
 /**
  * Define on which exceptions the debugger pauses.
  *
  * Requires there to be a current isolate.
  */
 DART_EXPORT Dart_Handle Dart_SetExceptionPauseInfo(
                             Dart_ExceptionPauseInfo pause_info);
 
@@ skipping 714 matching lines @@
  *
  * \return Returns an asynchronous id that must be passed to
  * Dart_TimelineAsyncInstant and Dart_TimelineAsyncEnd.
  *
  * NOTE: All timestamps should be acquired from Dart_TimelineGetMicros.
  */
 DART_EXPORT Dart_Handle Dart_TimelineAsyncEnd(const char* label,
                                               int64_t async_id);
 
 #endif  // INCLUDE_DART_TOOLS_API_H_