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

lib/compiler/implementation/apiimpl.dart

Index: lib/compiler/implementation/apiimpl.dart
diff --git a/lib/compiler/implementation/apiimpl.dart b/lib/compiler/implementation/apiimpl.dart
index 1f4cc97c9db4b58ab89297102afe709b3900840e..ca2eb39d4f95460198c690d4665cb8e519a5b5ab 100644
--- a/lib/compiler/implementation/apiimpl.dart
+++ b/lib/compiler/implementation/apiimpl.dart
@@ -31,6 +31,7 @@ class Compiler extends leg.Compiler {
             enableUserAssertions: hasOption(options, '--enable-checked-mode'),
             enableMinification: hasOption(options, '--minify'),
             emitJavaScript: !hasOption(options, '--output-type=dart'),
+            disallowUnsafeEval: hasOption(options, '--disallow-unsafe-eval'),
             strips: getStrips(options),
             enableConcreteTypeInference:
               hasOption(options, '--enable-concrete-type-inference'));