dump-info additionally dumps a json info file

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'
     show Future, EventSink;
 import 'dart:io'
     show exit, File, FileMode, Platform, RandomAccessFile, FileSystemException,
@@ skipping 400 matching lines @@
         uri = out;
         sourceMapFileName =
             sourceMapOut.path.substring(sourceMapOut.path.lastIndexOf('/') + 1);
       } else if (extension == 'precompiled.js') {
         uri = computePrecompiledUri();
         diagnosticHandler.info(
             "File ($uri) is compatible with header"
             " \"Content-Security-Policy: script-src 'self'\"");
       } else if (extension == 'js.map' || extension == 'dart.map') {
         uri = sourceMapOut;
-      } else if (extension == 'info.html') {
+      } else if (extension == 'info.html' || extension == "info.json") {
         String outName = out.path.substring(out.path.lastIndexOf('/') + 1);
-        uri = out.resolve('${outName}.$extension');
+        uri = out.resolve('$outName.$extension');
       } else {
         fail('Unknown extension: $extension');
       }
     } else {
       uri = out.resolve('$name.$extension');
     }
 
     if (uri.scheme != 'file') {
       fail('Unhandled scheme ${uri.scheme} in $uri.');
     }
@@ skipping 291 matching lines @@
       } else {
         print(">>> TEST FAIL");
       }
       stderr.writeln(">>> EOF STDERR");
       runJob();
     });
   }
 
   runJob();
 }