Change how debugger handles source breakpoints

tests/standalone/debugger/local_function_test.dart

+// 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.
+
+// This test forks a second vm process that runs this dart script as
+// a debug target.
+// Run this test with option --wire to see the json messages sent
+// between the processes.
+// Run this test with option --verbose to see the stdout and stderr output
+// of the debug target process.
+
+import "debug_lib.dart";
+
+// Check that if a breakpoint is requested on the line containing the
+// one-liner with a local function below, the breakpoint gets set in
+// the outer function.
+foo(x) => (n) => x * n;
+
+// Check that if a breakpoint is requested on the line "return n*x"
+// below, the breakpoint is set in the local function (closure).
+bar(x) {
+  return (n) {
+    return n * x;
+  };
+}
+
+main(List<String> arguments) {
+  if (RunScript(testScript, arguments)) return;
+  print("Hello from debuggee");
+  var f = foo(10);  // Hits breakpoint.
+  print(f(5));
+  var b = bar(10);
+  print(b(10)); // Hits breakpoint.
+}
+
+// Expected debugger events and commands.
+var testScript = [
+  MatchFrame(0, "main"),  // Top frame in trace is function "main".
+  SetBreakpoint(17),      // Set breakpoint in function foo.
+  SetBreakpoint(23),      // Set breakpoint in local function inside bar.
+  Resume(),
+  MatchFrames(["foo", "main"]),
+  Resume(),
+  MatchFrames(["<anonymous closure>", "main"]),
+  Resume()
+];