Issue 7884. Use UTF-8 for output.

compiler/java/com/google/dart/compiler/DartCompiler.java

Index: compiler/java/com/google/dart/compiler/DartCompiler.java
diff --git a/compiler/java/com/google/dart/compiler/DartCompiler.java b/compiler/java/com/google/dart/compiler/DartCompiler.java
index 98493b2062ab7ea961c5cd2204cc28969dc9cdf1..2378d681e56a247d4cd6e5a72df44a1e1097cd41 100644
--- a/compiler/java/com/google/dart/compiler/DartCompiler.java
+++ b/compiler/java/com/google/dart/compiler/DartCompiler.java
@@ -1008,6 +1008,10 @@ public class DartCompiler {
     CompilerOptions topCompilerOptions = processCommandLineOptions(topArgs);
     boolean result = false;
     try {
+      // configure UTF-8 output
+      System.setOut(new PrintStream(System.out, true, "UTF-8"));
+      System.setErr(new PrintStream(System.err, true, "UTF-8"));
+
       if (topCompilerOptions.showVersion()) {
         showVersion(topCompilerOptions);
         System.exit(0);