Add API to configure debugger pause on exception

tools/ddbg.dart

 // Copyright (c) 2012, 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.
 
 // Simple interactive debugger shell that connects to the Dart VM's debugger
 // connection port.
 
 #import("dart:io");
 #import("dart:json");
 
@@ skipping 23 matching lines @@
   so  Step over
   si  Step into
   sbp [<file>] <line> Set breakpoint
   rbp <id> Remove breakpoint with given id
   po <id> Print object info for given id
   pc <id> Print class info for given id
   ll  List loaded libraries
   pl <id> Print dlibrary info for given id
   ls <libname> List loaded scripts in library
   gs <lib_id> <script_url> Get source text of script in library
+  epi <none|all|unhandled>  Set exception pause info
   h   Print help
 """);
 }
 
 
 void quitShell() {
   vmStream.close();
   vmSock.close();
   stdin.close();
 }
@@ skipping 63 matching lines @@
     sendCmd(cmd).then((result) => handleGetClassPropsResponse(result));
   } else if (command == "pl" && args.length == 2) {
     var cmd = { "id": seqNum, "command": "getLibraryProperties",
                 "params": {"libraryId": Math.parseInt(args[1]) }};
     sendCmd(cmd).then((result) => handleGetLibraryPropsResponse(result));
   } else if (command == "gs" && args.length == 3) {
     var cmd = { "id": seqNum, "command":  "getScriptSource",
                 "params": { "libraryId": Math.parseInt(args[1]),
                             "url": args[2] }};
     sendCmd(cmd).then((result) => handleGetSourceResponse(result));
+  } else if (command == "epi" && args.length == 2) {
+    var cmd = { "id": seqNum, "command":  "setPauseOnException",
+                "params": { "exceptions": args[1] }};
+    sendCmd(cmd).then((result) => handleGenericResponse(result));
   } else if (command == "q") {
     quitShell();
   } else if (command == "h") {
     printHelp();
   } else {
     print("command '$command' not understood, try h for help");
   }
 }
 
 
@@ skipping 240 matching lines @@
   };
   vmInStream.onError = (err) {
     print("Error in debug connection: $err");
     quitShell();
   };
   vmInStream.onClosed = () {
     print("VM debugger connection closed");
     quitShell();
   };
 }