Move all flags to CompilerOptions (first step to stop passing the compiler to

pkg/compiler/lib/src/js/js.dart

Index: pkg/compiler/lib/src/js/js.dart
diff --git a/pkg/compiler/lib/src/js/js.dart b/pkg/compiler/lib/src/js/js.dart
index df510a854fcbb38363ccd9028427d0b70f267b38..837b9feadbcdf1729acf63ba183ff45badeb4504 100644
--- a/pkg/compiler/lib/src/js/js.dart
+++ b/pkg/compiler/lib/src/js/js.dart
@@ -27,7 +27,7 @@ String prettyPrint(
      Renamer renamerForNames: JavaScriptPrintingOptions.identityRenamer}) {
   // TODO(johnniwinther): Do we need all the options here?
   JavaScriptPrintingOptions options = new JavaScriptPrintingOptions(
-      shouldCompressOutput: compiler.enableMinification,
+      shouldCompressOutput: compiler.options.enableMinification,
       minifyLocalVariables: allowVariableMinification,
       preferSemicolonToNewlineInMinifiedOutput: USE_LAZY_EMITTER,
       renamerForNames: renamerForNames);
@@ -47,7 +47,7 @@ CodeBuffer createCodeBuffer(
   JavaScriptSourceInformationStrategy sourceInformationFactory =
       compiler.backend.sourceInformationStrategy;
   JavaScriptPrintingOptions options = new JavaScriptPrintingOptions(
-      shouldCompressOutput: compiler.enableMinification,
+      shouldCompressOutput: compiler.options.enableMinification,
       minifyLocalVariables: allowVariableMinification,
       preferSemicolonToNewlineInMinifiedOutput: USE_LAZY_EMITTER,
       renamerForNames: renamerForNames);