Add a content-security-policy (CSP) flag.

lib/compiler/implementation/dart2js.dart

 // Copyright (c) 2012, 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');
 
 #import('dart:io');
 #import('dart:uri');
 #import('dart:utf');
 
@@ skipping 137 matching lines @@
     new OptionHandler('--force-strip=.*', setStrip),
     // TODO(ahe): Remove the --no-colors option.
     new OptionHandler('--disable-diagnostic-colors',
                       (_) => enableColors = false),
     new OptionHandler('--enable-diagnostic-colors', (_) => enableColors = true),
     new OptionHandler('--enable[_-]checked[_-]mode|--checked',
                       (_) => passThrough('--enable-checked-mode')),
     new OptionHandler('--enable-concrete-type-inference',
                       (_) => passThrough('--enable-concrete-type-inference')),
     new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
-    new OptionHandler(r'--package-root=.+|-p.+', setPackageRoot),
+    new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
+    new OptionHandler('--enable-content-security-policy', passThrough),
     // The following two options must come last.
     new OptionHandler('-.*', (String argument) {
       helpAndFail('Error: Unknown option "$argument".');
     }),
     new OptionHandler('.*', (String argument) {
       arguments.add(nativeToUriPath(argument));
     })
   ];
 
   parseCommandLine(handlers, argv);
@@ skipping 216 matching lines @@
     Throw an exception if a compile-time error is detected.
 
   --library-root=<directory>
     Where to find the Dart platform libraries.
 
   --allow-mock-compilation
     Do not generate a call to main if either of the following
     libraries are used: dart:dom, dart:html dart:io.
 
   --enable-concrete-type-inference
-    Enable experimental concrete type inference.''');
+    Enable experimental concrete type inference.
+
+  --enable-content-security-policy
+    Emit JavaScript code that satisfies the CSP restrictions. This flag is
+    not continuously tested. Please report breakages and we will fix them
+    as soon as possible.''');
 }
 
 void helpAndExit(bool verbose) {
   if (verbose) {
     verboseHelp();
   } else {
     help();
   }
   exit(0);
 }
@@ skipping 13 matching lines @@
     } catch (ignored) {
       print('Internal error: error while printing exception');
     }
     try {
       print(trace);
     } finally {
       exit(253); // 253 is recognized as a crash by our test scripts.
     }
   }
 }