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

lib/compiler/implementation/compiler.dart

Index: lib/compiler/implementation/compiler.dart
diff --git a/lib/compiler/implementation/compiler.dart b/lib/compiler/implementation/compiler.dart
index b89a90d7d420bab51807249114293add746965fb..3ace0dbe395d830b3252095c5c284974d9a0e8c0 100644
--- a/lib/compiler/implementation/compiler.dart
+++ b/lib/compiler/implementation/compiler.dart
@@ -201,6 +201,7 @@ abstract class Compiler implements DiagnosticListener {
             this.enableMinification: false,
             bool emitJavaScript: true,
             bool generateSourceMap: true,
+            bool disallowUnsafeEval: false,
             List<String> strips: const []})
       : libraries = new Map<String, LibraryElement>(),
         progress = new Stopwatch() {
@@ -217,7 +218,9 @@ abstract class Compiler implements DiagnosticListener {
     checker = new TypeCheckerTask(this);
     typesTask = new ti.TypesTask(this, enableConcreteTypeInference);
     backend = emitJavaScript ?
-        new js_backend.JavaScriptBackend(this, generateSourceMap) :
+        new js_backend.JavaScriptBackend(this,
+                                         generateSourceMap,
+                                         disallowUnsafeEval) :
         new dart_backend.DartBackend(this, strips);
     constantHandler = new ConstantHandler(this, backend.constantSystem);
     enqueuer = new EnqueueTask(this);