Issue 8051. Make extended exit codes optional.

compiler/java/com/google/dart/compiler/CommandLineOptions.java

Index: compiler/java/com/google/dart/compiler/CommandLineOptions.java
diff --git a/compiler/java/com/google/dart/compiler/CommandLineOptions.java b/compiler/java/com/google/dart/compiler/CommandLineOptions.java
index 440b7bb2a6ed1dd823a2a0d150758ad684e19261..6d11bbc26d169fe7c7e68a56ce9131f816060aec 100644
--- a/compiler/java/com/google/dart/compiler/CommandLineOptions.java
+++ b/compiler/java/com/google/dart/compiler/CommandLineOptions.java
@@ -35,6 +35,10 @@ public class CommandLineOptions {
     @Option(name = "--error_format",
         usage = "Format errors as normal or machine")
     private String errorFormat = "";
+    
+    @Option(name = "--extended-exit-code",
+        usage = "0 - clean; 1 - has warnings; 2 - has errors")
+    private boolean extendedExitCode = false;
 
     @Option(name = "--enable_type_checks",
         usage = "Generate runtime type checks")
@@ -149,6 +153,10 @@ public class CommandLineOptions {
     public File getDartSdkPath() {
       return dartSdkPath;
     }
+    
+    public boolean extendedExitCode() {
+      return extendedExitCode;
+    }
 
     /**
      * Returns whether warnings from SDK files should be suppressed.