Add a command-line option for generating source maps.

compiler/java/com/google/dart/compiler/CommandLineOptions.java

 // 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.
 
 package com.google.dart.compiler;
 
 import com.google.common.collect.Lists;
 import com.google.dart.runner.DartRunner;
 import com.google.dart.runner.RunnerOptions;
 
@@ skipping 48 matching lines @@
     private String documentationOutputDirectory = null;
 
     @Option(name = "--generate-documentation", aliases = { "-generate-documentation" },
         usage = "Generate docs from source")
     private boolean generateDocumentation = false;
 
     @Option(name = "--generate-isolate-stubs", aliases = { "-generate-isolate-stubs" },
         usage = "Classes to generate stubs\n (comma-separated list)")
     private String generateIsolateStubs = null;
 
+    @Option(name = "--generate-source-maps",

[zundel, 2011/10/17 17:28:46]

vm uses underscores instead of dashes to separate words in options.  Since their
arg parsing mechanism doesn't actually have a choice in this, I'd like us to
switch to that now that we are post-technology-preview.

[John Lenz, 2011/10/17 18:38:35]

Done.

+        usage = "Generate source maps")
+    private boolean generateSourceMaps = false;
+
     @Option(name = "--human-readable-output",
         usage = "Write human readable javascript")
     private boolean generateHumanReadableOutput = false;
 
     @Option(name = "--ignore-unrecognized-flags",
         usage = "Ignore unrecognized command line flags")
     private boolean ignoreUnrecognizedFlags = false;
 
     @Option(name = "--isolate-stub-out", aliases = { "-isolate-stub-out" },
         usage = "File to receive generated stub output")
@@ skipping 139 matching lines @@
     }
 
     public boolean shouldBatch() {
       return batch;
     }
 
     public boolean disableTypeOptimizations() {
       return disableTypeOptimizations;
     }
 
+    public boolean generateSourceMaps() {
+      return generateSourceMaps;
+    }
+
     public boolean generateHumanReadableOutput() {
       return generateHumanReadableOutput;
     }
 
     /**
      * @return the path to receive compiler output.
      */
     public File getOutputFilename() {
       return outputFilename;
     }
@@ skipping 159 matching lines @@
           args = newArgs.toArray(new String[newArgs.size()]);
           cmdLineParser = new CmdLineParser(parsedOptions);
           continue;
         }
       }
       break;
     }
     return cmdLineParser;
   }
 }