Generate out.precompiled.js, not precompiled.js.

dart/sdk/lib/_internal/compiler/implementation/dart2js.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.
 
 library dart2js.cmdline;
 
 import 'dart:async';
 import 'dart:io'
     show exit, File, FileMode, Options, Platform, RandomAccessFile;
 import 'dart:math' as math;
@@ skipping 295 matching lines @@
     }
     writeString(Uri.parse('$out.deps'),
                 getDepsOutput(inputProvider.sourceFiles));
     diagnosticHandler.info(
          'compiled ${inputProvider.dartCharactersRead} characters Dart '
          '-> $totalCharactersWritten characters $outputLanguage '
          'in ${relativize(currentDirectory, out, isWindows)}');
     if (!explicitOut) {
       String input = uriPathToNative(arguments[0]);
       String output = relativize(currentDirectory, out, isWindows);
-      print('Dart file $input compiled to $outputLanguage: $output');
+      print('Dart file ($input) compiled to $outputLanguage: $output');

[ahe, 2013/09/23 17:13:42]

Since I'm touching this, I figured I could fix http://dartbug.com/6880 at the
same time.

     }
   }
 
   EventSink<String> outputProvider(String name, String extension) {
     Uri uri;
     String sourceMapFileName;
     bool isPrimaryOutput = false;
     if (name == '') {
       if (extension == 'js' || extension == 'dart') {
         isPrimaryOutput = true;
         uri = out;
         sourceMapFileName =
             sourceMapOut.path.substring(sourceMapOut.path.lastIndexOf('/') + 1);
+      } else if (extension == 'precompiled.js') {
+        String outPath = out.path;
+        if (outPath.endsWith('.js')) {
+          outPath = outPath.substring(0, outPath.length - 3);
+          uri = out.resolve('$outPath.$extension');
+        } else {
+          uri = out.resolve(extension);
+        }
+        diagnosticHandler.info(
+            "File ($uri) is compatible with header"
+            " \"Content-Security-Policy: script-src 'self'\"");
       } else if (extension == 'js.map' || extension == 'dart.map') {
         uri = sourceMapOut;
       } else {
         fail('Error: Unknown extension: $extension');
       }
     } else {
       uri = out.resolve('$name.$extension');
     }
 
     if (uri.scheme != 'file') {
@@ skipping 232 matching lines @@
       }
     } finally {
       exit(253); // 253 is recognized as a crash by our test scripts.
     }
   });
 }
 
 void main() {
   mainWithErrorHandler(new Options());
 }