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

dart/sdk/lib/_internal/compiler/implementation/dart2js.dart

Index: dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart b/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
index 68f7358bf50dd9e1bf687ce7011caa444f574540..989ae34d059074f74e6b935d71c0d808be48ba7a 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/dart2js.dart
@@ -313,7 +313,7 @@ Future compile(List<String> argv) {
     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.

     }
   }
 
@@ -327,6 +327,17 @@ Future compile(List<String> argv) {
         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 {