Add kInvalidExceptionPauseInfo and fix the build

runtime/vm/service.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 3001 matching lines @@
   "None",
   "Unhandled",
   NULL,
 };
 
 
 static Dart_ExceptionPauseInfo exception_pause_mode_values[] = {
   kPauseOnAllExceptions,
   kNoPauseOnExceptions,
   kPauseOnUnhandledExceptions,
-  static_cast<Dart_ExceptionPauseInfo>(-1),  // Fall through.
+  kInvalidExceptionPauseInfo,
 };
 
 
 static const MethodParameter* set_exception_pause_mode_params[] = {
   ISOLATE_PARAMETER,
   new EnumParameter("mode", true, exception_pause_mode_names),
   NULL,
 };
 
 
 static bool SetExceptionPauseMode(Isolate* isolate, JSONStream* js) {
   const char* mode = js->LookupParam("mode");
   if (mode == NULL) {
     PrintMissingParamError(js, "mode");
     return true;
   }
   Dart_ExceptionPauseInfo info =
       EnumMapper(mode, exception_pause_mode_names, exception_pause_mode_values);
-  if (info == -1) {
+  if (info == kInvalidExceptionPauseInfo) {
     PrintInvalidParamError(js, "mode");
     return true;
   }
   isolate->debugger()->SetExceptionPauseInfo(info);
   if (Service::debug_stream.enabled()) {
     ServiceEvent event(isolate, ServiceEvent::kDebuggerSettingsUpdate);
     Service::HandleEvent(&event);
   }
   PrintSuccess(js);
   return true;
@@ skipping 236 matching lines @@
     ServiceMethodDescriptor& method = service_methods_[i];
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 
 }  // namespace dart